Best Kai'Sa Build & Guide (2026) — League of Legends

Kai'Sa is League of Legends' Daughter of the Void — a marksman who was swallowed by the Void as a child and survived by bonding with a living Void carapace that grants her adaptive weaponry. Kai'Sa is unique among ADCs because her abilities evolve when she reaches specific bonus stat thresholds from items and levels, transforming her basic kit into a supercharged arsenal with longer range, more missiles, and stealth. She is primarily played in the bot lane as an ADC where her combination of burst damage from Icathian Rain, poke from Void Seeker, invisibility from Supercharge, and dive potential from Killer Instinct make her one of the most versatile marksmen in the game — capable of assassinating isolated targets, melting frontlines with on-hit damage, and repositioning aggressively into the backline. Whether you're an ADC main looking for a hybrid-damage carry who scales into a late-game monster or a player who wants a marksman with assassin-like dive potential, this guide covers everything you need to dominate with Kai'Sa in 2026.

Kai'Sa Overview

Kai'Sa operates as an evolving hybrid-damage marksman whose unique identity comes from ability evolutions that unlock at specific bonus stat thresholds — 100 bonus AD evolves Q, 100 bonus AP evolves W, and 100 bonus attack speed evolves E. Her passive, Second Skin, causes Kai'Sa's basic attacks and allied immobilizing crowd control to stack Plasma on enemies. At four Plasma stacks, the target takes bonus magic damage based on their missing health. Caustic Wounds from nearby allied CC also apply Plasma stacks, meaning a single ally stun can set up Kai'Sa for an immediate Plasma detonation with just one or two auto-attacks. Second Skin is the engine that drives Kai'Sa's burst because the missing-health damage is enormous on targets already low from a teamfight — it executes wounded enemies.

Icathian Rain (Q) is Kai'Sa's primary burst ability. Kai'Sa launches a swarm of missiles that split evenly among nearby enemies, with each missile dealing physical damage. When there are fewer targets nearby, individual targets take more missiles and therefore more damage. Isolated Q — where all missiles hit a single target — is Kai'Sa's highest burst tool and the reason she excels at picking off lone targets in side lanes or catching someone separated from their team. When Q evolves at 100 bonus AD, the number of missiles increases significantly, dramatically amplifying isolated burst and multi-target waveclear.

Void Seeker (W) is Kai'Sa's long-range poke and scouting tool. Kai'Sa fires a Void bolt that deals magic damage, applies two Plasma stacks, and reveals the first enemy hit. Void Seeker's long range lets Kai'Sa poke from safety and set up Plasma detonations from a distance — two W stacks plus two auto-attacks triggers the passive burst. When W evolves at 100 bonus AP, it applies three Plasma stacks instead of two and refunds a portion of its cooldown on champion hit, turning Void Seeker into a spammable long-range poke tool that sets up near-instant Plasma detonations with a single follow-up auto-attack.

Supercharge (E) is Kai'Sa's steroid and repositioning tool. Kai'Sa charges up briefly, gaining massive bonus movement speed during the charge. After the charge completes, Kai'Sa gains a large attack speed bonus for several seconds. Supercharge briefly locks Kai'Sa out of auto-attacking during the charge, but the movement speed lets her reposition aggressively or defensively. When E evolves at 100 bonus attack speed, Supercharge grants invisibility during the charge, giving Kai'Sa a stealth repositioning tool that makes her nearly impossible to target during teamfights.

Killer Instinct (R) is the ability that defines Kai'Sa's aggressive playstyle. Kai'Sa dashes to a location near an enemy champion who has Plasma stacks, gaining a large damage-absorbing shield on arrival. Killer Instinct's range is enormous — Kai'Sa can dive from the edge of a teamfight directly onto a Plasma-marked carry in the backline. The shield on arrival provides survivability for the dive, and the repositioning lets Kai'Sa follow up with isolated Icathian Rain for maximum burst. Killer Instinct turns Kai'Sa from a standard ADC into an assassin-marksman hybrid who can engage fights rather than just kite them.

Strengths

• Ability evolutions transform Kai'Sa's kit as the game progresses, giving her dramatically increasing power at specific item breakpoints that no other ADC can match — each evolution fundamentally changes how an ability functions rather than just increasing its numbers — Q evolution massively increases missile count for devastating isolated burst, W evolution turns a poke tool into a spammable long-range harassment ability that nearly instant-procs Plasma, and E evolution adds stealth that makes Kai'Sa untargetable during repositioning. These evolutions make Kai'Sa's power curve feel like discrete jumps rather than gradual scaling
• Killer Instinct lets Kai'Sa dive onto Plasma-marked enemies from extreme range with a massive shield, giving her assassin-level engage potential that no other ADC possesses while maintaining the sustained DPS of a marksman after arrival — Most ADCs are immobile and rely on their team to bring fights to them, but Kai'Sa can dash across an entire teamfight to land on a marked carry and burst them with isolated Q. The shield prevents her from dying on arrival, and the reposition puts her in optimal range for follow-up auto-attacks
• Second Skin passive deals massive missing-health magic damage that scales with Plasma stacks applied by both Kai'Sa's attacks and allied crowd control, creating a synergy with CC-heavy team compositions that makes Kai'Sa's burst exponentially stronger with the right allies — A single Leona stun or Nautilus hook applies Plasma stacks, meaning Kai'Sa only needs one or two auto-attacks to detonate Plasma on a target her support locked down. The missing-health scaling means Plasma detonation functions as an execute, deleting low-health targets
• Hybrid damage profile from physical Q, magic W, and magic passive makes Kai'Sa extremely difficult to itemize against — enemies who stack armor to reduce her auto-attack and Q damage still take full magic damage from Plasma detonations and W poke, and enemies who stack magic resist still take full physical damage from her auto-attacks and Q — This forces enemies into suboptimal itemization choices because no single resistance stat effectively reduces Kai'Sa's total damage output

Weaknesses

• Kai'Sa's auto-attack range is among the shortest of all ADCs at 525, meaning she must position closer to danger than longer-range carries like Caitlyn, Jinx, or Aphelios, making her vulnerable to crowd control and burst from enemies who can reach her short range — The short range means Kai'Sa often takes damage while auto-attacking that longer-range ADCs avoid entirely. In teamfights, she must step dangerously close to tanks and fighters to deal sustained damage, putting her in range of abilities that outrange her auto-attacks
• Kai'Sa's laning phase before first evolution is weak compared to lane-dominant ADCs, with low base damage on auto-attacks and limited trading tools that make her vulnerable to aggressive bot lane duos who can punish her before she completes her Q evolution item spike — Champions like Draven, Lucian, and Miss Fortune out-trade Kai'Sa in the early levels because their base damage and trading abilities are stronger. Kai'Sa needs to survive lane and farm toward her first item to unlock Q evolution before she can fight effectively
• Icathian Rain's damage is split among all nearby targets, meaning Kai'Sa's primary burst tool deals dramatically less damage in minion waves or grouped teamfights compared to isolated targets — her assassination potential requires catching enemies alone or on the fight's edge — In the middle of a minion wave, Q missiles spread across six or more targets and each target takes minimal damage. Kai'Sa must find angles where Q hits only the intended target, which requires careful positioning that isn't always available in chaotic teamfights
• Killer Instinct requires Plasma stacks on the target to dash to them, meaning Kai'Sa cannot engage fights without first applying Plasma through auto-attacks, W, or allied CC — if she can't reach a target to stack Plasma, her signature dive ability is completely unavailable — Unlike assassins who can engage from fog of war, Kai'Sa needs Plasma on her target before she can ult. Against teams with long-range poke that keep Kai'Sa at arm's length, she may never get Plasma on the right target and has to ult suboptimally or not at all

Recommended Runes

Primary — Hail of Blades (Domination)

• Hail of Blades — Grants massively increased attack speed for the first three auto-attacks against enemy champions. Hail of Blades is Kai'Sa's optimal keystone because three rapid auto-attacks apply three Plasma stacks instantly, setting up a Plasma detonation with just one more auto-attack or a single allied CC application. The burst of attack speed also lets Kai'Sa weave three autos between Q and W in a rapid burst combo that procs Plasma before enemies can react. No other keystone enables Kai'Sa's burst trading pattern as effectively in the early and mid game.
• Taste of Blood — Heals Kai'Sa when she damages an enemy champion. Taste of Blood provides sustain during short trades in the laning phase, healing Kai'Sa after each Hail of Blades trade. The heal is on a short cooldown that aligns with Kai'Sa's trade-then-farm-then-trade-again laning pattern, keeping her healthy enough to survive against aggressive lane opponents until she reaches her first evolution.
• Eyeball Collection — Grants permanent adaptive force from champion takedowns. Eyeball Collection provides scaling AD that contributes toward Kai'Sa's Q evolution threshold. Each stack of AD from champion kills or assists brings Kai'Sa closer to the 100 bonus AD required for Q evolution, potentially unlocking the evolution slightly earlier than items alone would provide.
• Treasure Hunter — Grants bonus gold from unique champion takedowns. Treasure Hunter accelerates Kai'Sa's item progression by providing extra gold from kills and assists on unique enemy champions. Faster gold means faster item completion, which means earlier ability evolutions. Since Kai'Sa's power spikes are tied to specific items that unlock evolutions, accelerating gold generation directly accelerates her evolution timings.

Secondary — Precision

• Presence of Mind — Restores mana on champion takedowns and increases mana regeneration while damaging enemy champions. Presence of Mind solves Kai'Sa's mana issues in extended fights and skirmishes. Kai'Sa's Q and W are mana-hungry abilities that she wants to cast repeatedly in fights, and running out of mana in the middle of a teamfight cripples her burst. The mana restoration on takedowns lets Kai'Sa chain kills without going OOM.
• Legend: Alacrity — Grants permanent bonus attack speed from champion takedowns, large monster kills, and minion kills. Legend: Alacrity provides scaling attack speed that contributes toward Kai'Sa's E evolution threshold. The passive attack speed stacking throughout the game brings Kai'Sa closer to the 100 bonus attack speed needed for E evolution, and the extra attack speed increases her sustained DPS and Plasma stack application rate.

Recommended Item Build

Based on data from over 12,800 ranked Kai'Sa matches tracked on dodge.gg, here's the highest winrate build path.

Early Game (0–10 min)

• Doran's Blade — Grants attack damage, health, and omnivamp. Doran's Blade is Kai'Sa's standard start because the AD contributes toward Q evolution, the health provides survivability in lane trades, and the omnivamp sustains Kai'Sa through poke damage. The AD is especially important because Kai'Sa's early trading relies on Q and auto-attack damage, which Doran's Blade amplifies.
• Health Potion — Restores health over time. A Health Potion supplements Doran's Blade omnivamp and provides emergency sustain after unfavorable trades. Kai'Sa's short auto-attack range means she takes more trade damage than longer-range ADCs, making the extra healing necessary to stay in lane.
• Boots — Grants movement speed. Early boots improve Kai'Sa's ability to position for isolated Q angles, dodge skillshots, and kite in short trades. Movement speed is critical on Kai'Sa because her short auto-attack range means she needs to constantly reposition to stay in range of targets while avoiding enemy abilities.

Core Build (10–20 min)

• Statikk Shiv — Grants attack damage, attack speed, and critical strike chance, with an Energized passive that stores charges while moving and attacking, releasing a chain lightning bolt on the next auto-attack that deals bonus magic damage to multiple targets. Statikk Shiv is Kai'Sa's optimal first item because it provides both AD toward Q evolution and attack speed toward E evolution in a single purchase. The Energized chain lightning adds waveclear and burst damage to Kai'Sa's trading, and the magic damage component synergizes with her hybrid damage profile. The combination of AD and attack speed in one item accelerates both evolution timings simultaneously.
• Berserker's Greaves — Grants attack speed and movement speed. Berserker's Greaves provide a large chunk of attack speed that contributes toward E evolution and increases Kai'Sa's sustained DPS. The movement speed helps Kai'Sa kite in fights and reposition for isolated Q angles. Berserker's Greaves are the default boot choice because Kai'Sa values attack speed for both evolution progress and raw damage output.
• Infinity Edge — Grants attack damage and critical strike chance, with a passive that amplifies critical strike damage when Kai'Sa has sufficient critical strike chance. Infinity Edge provides a massive AD spike that ensures Q evolution if it hasn't been unlocked already, and the critical strike damage amplification dramatically increases Kai'Sa's auto-attack and Q burst. With Statikk Shiv and Infinity Edge, Kai'Sa has the AD for Q evolution and the critical strike scaling to make her auto-attacks devastating.

Late Game (25+ min)

• Blade of the Ruined King — Grants attack damage, attack speed, and lifesteal, with a passive that deals bonus physical damage based on the target's current health on each auto-attack. Blade of the Ruined King provides on-hit current-health damage that synergizes with Kai'Sa's Plasma passive missing-health damage — BotRK shreds targets when they're healthy, and Plasma executes them when they're low. The attack speed contributes to E evolution if not yet unlocked, and the lifesteal provides sustain in extended teamfights where Kai'Sa needs to survive while dealing damage.
• Nashor's Tooth — Grants ability power, attack speed, and a passive that adds bonus magic damage to auto-attacks. Nashor's Tooth provides the AP needed for W evolution and the attack speed that contributes to E evolution. The on-hit magic damage adds another layer to Kai'Sa's hybrid damage profile, making her even harder to itemize against. With W evolved, Kai'Sa gains spammable long-range poke that applies three Plasma stacks per hit, enabling near-instant Plasma detonations with a single follow-up auto-attack.
• Guardian Angel — Grants attack damage and armor, with a passive that revives Kai'Sa upon death. Guardian Angel provides insurance for Kai'Sa's aggressive Killer Instinct dives. When Kai'Sa ults into the enemy backline to assassinate a carry, the risk of dying during the dive is high. Guardian Angel's revive passive means Kai'Sa can commit to aggressive dives knowing she has a second chance if the enemy team collapses on her. The AD further amplifies Q and auto-attack damage.

Ability Priority

1. Icathian Rain (Q) — Max first. Each rank increases Q's base damage per missile, directly increasing Kai'Sa's burst and waveclear. Q is Kai'Sa's most important ability because isolated Q (all missiles hitting one target) is her primary burst tool for trades and kills. Maxing Q first provides the most damage per skill point and makes isolated Q trades devastating even before the evolution unlocks. Q max also improves waveclear speed for faster farming toward item powerspikes.
2. Supercharge (E) — Max second. Each rank increases the attack speed bonus and reduces the cooldown. E max second provides more frequent access to the massive attack speed steroid and the repositioning movement speed. After E evolves, each cast grants invisibility — reducing E's cooldown means more frequent stealth repositioning in fights. The attack speed bonus scales multiplicatively with Kai'Sa's items, making each rank increasingly valuable.
3. Void Seeker (W) — Max last. Void Seeker's primary value is the Plasma stacks it applies and the long-range scouting, which don't scale significantly with ranks. The base damage increase per rank is lower than Q and the utility increase is lower than E. A single point in W provides the two Plasma stacks (three when evolved) and vision that define the ability's utility. W's damage becomes relevant once it evolves with AP items in the late game, at which point it's already maxed.
4. Killer Instinct (R) — Level when available at 6, 11, and 16. Each rank increases the shield on arrival and reduces the cooldown. Rank-ups are significant powerspikes because the increased shield makes Killer Instinct dives safer — Kai'Sa absorbs more damage when she dives into the enemy team — and the reduced cooldown lets her use the ultimate more frequently in skirmishes and objective fights.

Playstyle Tips

Early Game / Laning Phase

Kai'Sa's early game is about farming safely toward her first item powerspike and Q evolution, trading with short Hail of Blades burst combos when opportunities arise, and avoiding extended fights against lane-dominant ADCs who outperform her before her first evolution. Kai'Sa is not a lane bully and should focus on reaching her Q evolution timing as quickly as possible.

Trade with Hail of Blades burst combos when the enemy positions poorly. Auto-attack three times rapidly with Hail of Blades to apply three Plasma stacks, then Q for isolated damage and the fourth Plasma stack triggers the detonation. This burst combo deals surprising damage and is Kai'Sa's strongest short trade pattern before Q evolution. Only take this trade when you can land isolated Q — if minions are nearby, the Q damage splits and the trade becomes inefficient.

Use W to poke from a safe distance and apply two Plasma stacks from range. Against aggressive lanes, W poke lets Kai'Sa contribute to trades without stepping into auto-attack range where she can be punished. If your support lands CC on the enemy, the CC applies Plasma stacks — follow up immediately with auto-attacks to detonate Plasma for burst damage.

Farm with Q to push waves quickly when the enemy bot lane backs or roams. Q clears caster minions efficiently, and fast wave pushing lets Kai'Sa accumulate gold toward her first item. Crash waves into the enemy tower when possible to generate free time for backing and purchasing components.

Respect your short auto-attack range against long-range ADCs like Caitlyn and Ashe. Step up only when Hail of Blades is available for a burst trade, then immediately disengage. Do not trade auto-attacks back and forth against longer-range carries because they will always get more hits than Kai'Sa.

Mid Game

Mid-game Kai'Sa with Q evolution is a burst-heavy carry who looks for isolated Q opportunities on lone targets, follows up on allied CC with Plasma detonations, and uses Killer Instinct to dive marked carries when the enemy team commits to a fight and burns their peel on other targets. The mid game is where Kai'Sa's evolution powerspikes transform her from a weak laner into a potent assassin-marksman.

After Q evolves, look for isolated Q opportunities constantly. Catching an enemy alone in a side lane, near an objective, or separated from their team in a skirmish means every Q missile hits them — evolved isolated Q deals massive damage that can chunk carries to half health or kill low-health targets outright. Position to find angles where Q won't split across multiple targets.

Coordinate with your support for Plasma detonation combos. When your support lands crowd control, the CC applies Plasma stacks. Immediately auto-attack the CC'd target to detonate Plasma for missing-health burst damage. With a support like Leona, Nautilus, or Thresh, the CC-into-Plasma-detonation combo deals enough burst to kill squishy targets from 60% health.

Use Killer Instinct aggressively but selectively. The ideal Killer Instinct play is to W a backline carry for Plasma stacks, then ult onto them after the enemy frontline has committed to engaging your team. The shield absorbs burst on arrival, and isolated Q plus auto-attacks finish the target. Do not ult into the entire enemy team at the start of a fight — wait for key abilities to be used before diving.

During mid-game objective fights around Dragon and Baron, use W to scout and apply Plasma stacks from long range. W's vision reveal checks bushes and the Plasma stacks set up potential Killer Instinct dives if the target is a priority.

Late Game

Late-game Kai'Sa with multiple evolutions is a hypercarry who can shred frontlines with on-hit damage, assassinate carries with Killer Instinct dives, poke from extreme range with evolved W, and reposition with evolved E invisibility — she is one of the most versatile and dangerous carries in the game at full build. The combination of all three evolutions makes Kai'Sa capable of filling multiple roles in a single teamfight.

In teamfights, use evolved W to poke before the fight starts. Evolved W applies three Plasma stacks and partially refunds its cooldown on champion hit, allowing Kai'Sa to spam Void Seekers from long range to chunk enemies and set up Plasma stacks for potential Killer Instinct dives. A single evolved W hit plus one auto-attack detonates Plasma, making W poke into a devastating pre-fight harass tool.

Activate Supercharge for the evolved invisibility when you need to reposition in teamfights. The stealth during the charge makes Kai'Sa untargetable and lets her reposition to find isolated Q angles, dodge key abilities, or escape dangerous positions. Use E invisibility to transition from auto-attacking the frontline to diving the backline — enemies lose track of Kai'Sa's position during the stealth.

The full-build late-game combo for assassination is: W to apply three Plasma stacks → R (Killer Instinct) to dash to the target with shield → E for invisibility and attack speed → auto-attack to proc fourth Plasma stack and detonate → Q for isolated burst. This combo deletes squishy targets in under two seconds and the invisibility from E makes it extremely difficult for enemies to peel for their carry.

In fights against tanky frontlines, switch from burst to sustained DPS. Blade of the Ruined King's current-health on-hit damage, Nashor's Tooth on-hit magic damage, and Plasma passive missing-health detonations combine to shred tanks from both ends of the health bar. Auto-attack continuously with the massive attack speed from Supercharge and items, and let the on-hit damage do the work. Kai'Sa's hybrid damage profile means tanks who stacked armor still take heavy magic damage from passive and Nashor's Tooth.

Matchups

Favorable

• Kog'Maw — Kog'Maw is a hyperscaling ADC who relies on Bio-Arcane Barrage range to deal percentage-health damage from a safe distance. Kai'Sa has a favorable matchup because Kog'Maw has no mobility and no way to stop Kai'Sa's Killer Instinct dive. Once Kai'Sa gets Plasma stacks on Kog'Maw, she can ult directly onto him and burst him with isolated Q before he can retaliate. Kog'Maw's lack of self-peel means he is entirely dependent on his support to stop Kai'Sa's dive, and without peel he dies instantly.
• Twitch — Twitch is a stealth-based ADC who relies on ambush positioning and Spray and Pray for teamfight damage. Kai'Sa has a favorable matchup because Void Seeker's vision reveal counters Twitch's stealth, and Kai'Sa's burst combo kills Twitch before Spray and Pray's sustained damage can ramp up. Twitch's low health pool and lack of defensive abilities make him an easy Killer Instinct target, and isolated Q on Twitch deals devastating damage.
• Varus — Varus is a poke-and-engage ADC who relies on Piercing Arrow poke and Chain of Corruption to initiate fights. Kai'Sa has a favorable matchup because she can dodge Piercing Arrow with Supercharge movement speed, and Varus has no mobility to escape Killer Instinct dives. Once Kai'Sa reaches Varus with ult, his immobility means he cannot avoid isolated Q burst. Varus's Chain of Corruption is dangerous if it lands, but Kai'Sa's evolved E invisibility can make her an unreliable target for the skillshot.

Even

• Jinx — Jinx is a hyperscaling ADC who switches between minigun attack speed and rocket long-range poke. The matchup is even because Jinx outranges Kai'Sa with rockets and has stronger teamfight DPS with Get Excited resets, but Kai'Sa has stronger burst and can dive Jinx with Killer Instinct since Jinx has only Flame Chompers for self-peel. Jinx wins extended teamfights if she gets a reset, but Kai'Sa wins all-ins and picks where she can isolate Jinx from her team.
• Jhin — Jhin is a utility-marksman who deals burst damage with fourth-shot auto-attacks and Curtain Call executions. The matchup is even because Jhin's fourth shot and W root punish Kai'Sa's short range, but Kai'Sa's sustained DPS and Killer Instinct dive overwhelm Jhin in extended fights. Jhin's lack of attack speed scaling means Kai'Sa out-DPSes him in prolonged engagements, but Jhin's long-range utility and burst can kill Kai'Sa before she reaches him if she doesn't have ult.
• Xayah — Xayah is a feather-wielding ADC with Bladecaller root and Featherstorm invulnerability. The matchup is even because Xayah's Featherstorm makes her temporarily untargetable when Kai'Sa dives with Killer Instinct, wasting Kai'Sa's ult cooldown. Xayah's Bladecaller root also punishes Kai'Sa for diving into melee range. However, Kai'Sa outscales Xayah and has more versatile damage profiles. The matchup depends on whether Xayah holds Featherstorm for Kai'Sa's Killer Instinct dive.

Unfavorable

• Draven — Draven is an early-game lane bully who deals massive damage with Spinning Axes. Kai'Sa struggles in this matchup because Draven's Spinning Axe auto-attacks deal far more damage than Kai'Sa's autos in the early levels, and his Blood Rush movement speed lets him chase Kai'Sa when she tries to disengage from trades. Draven's aggressive laning can snowball kills before Kai'Sa reaches Q evolution, putting her permanently behind. Even with Killer Instinct, diving Draven is risky because his raw damage can kill Kai'Sa through the shield.
• Caitlyn — Caitlyn is a long-range ADC who dominates lane with auto-attack range and Piltover Peacemaker poke. Kai'Sa struggles because Caitlyn's 650 auto-attack range versus Kai'Sa's 525 means Caitlyn gets free auto-attacks that Kai'Sa cannot answer without stepping into danger. Caitlyn's trap zone control makes Kai'Sa's short-range trading pattern risky, and 90 Caliber Net provides escape from Killer Instinct dives. Caitlyn can bully Kai'Sa out of lane and delay her Q evolution timing significantly.
• Lucian — Lucian is a mobile ADC with burst trading from Lightslinger passive double-shots and Relentless Pursuit dash. Kai'Sa struggles because Lucian's short-trade burst with Lightslinger passive deals more damage than Kai'Sa's Hail of Blades combo at all points in the laning phase, and Relentless Pursuit lets Lucian dodge Q missiles and disengage Kai'Sa's follow-up damage. Lucian's early-game dominance creates a gold lead that delays Kai'Sa's evolution timings, and his mobility makes him a slippery Killer Instinct target.

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