diff --git a/unity/Assets/2.5D Engine/Enemy.prefab b/unity/Assets/2.5D Engine/Enemy.prefab
index d66132a..4cf9307 100644
--- a/unity/Assets/2.5D Engine/Enemy.prefab	
+++ b/unity/Assets/2.5D Engine/Enemy.prefab	
@@ -1,16 +1,17 @@
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diff --git a/unity/Assets/2.5D Engine/Scripts/EnemyAI.cs b/unity/Assets/2.5D Engine/Scripts/EnemyAI.cs
deleted file mode 100644
index 24f0edf..0000000
--- a/unity/Assets/2.5D Engine/Scripts/EnemyAI.cs	
+++ /dev/null
@@ -1,52 +0,0 @@
-using UnityEngine;
-
-namespace IndianOceanAssets.Engine2_5D
-{
-    // Controls enemy behavior: follows player and handles collision.
-    public class EnemyAI : MonoBehaviour
-    {
-        private Transform target; // Reference to the player
-        [SerializeField] private float speed; // Movement speed
-        [SerializeField] private int damageAmount; // Damage dealt to player
-        [SerializeField] private SpriteRenderer spriteRenderer; // For flipping sprite
-
-        // Called on start
-        public void Start()
-        {
-            Invoke("AssignPlayer", 1f); // Delay to ensure player exists
-        }
-
-        // Finds and assigns the player as target
-        public void AssignPlayer()
-        {
-            target = GameObject.FindGameObjectWithTag("Player").transform;
-        }
-
-        // Called every frame
-        public void Update()
-        {
-            if (target)
-            {
-                // Flip sprite based on direction to player
-                if (target.position.x > transform.position.x)
-                    spriteRenderer.flipX = false;
-                else
-                    spriteRenderer.flipX = true;
-
-                // Move towards player
-                transform.position = Vector3.MoveTowards(transform.position, target.position, Time.deltaTime * speed);
-            }
-        }
-
-        // Handles collision with player
-        void OnCollisionEnter(Collision collision)
-        {
-            if (collision.collider.CompareTag("Player"))
-            {
-                // Damage player and kill self
-                collision.collider.GetComponent<HealthSystem>().Damage(damageAmount);
-                GetComponent<HealthSystem>().Die();
-            }
-        }
-    }
-}
\ No newline at end of file
diff --git a/unity/Assets/2.5D Engine/Scripts/EnemySpawner.cs b/unity/Assets/2.5D Engine/Scripts/EnemySpawner.cs
deleted file mode 100644
index a75f273..0000000
--- a/unity/Assets/2.5D Engine/Scripts/EnemySpawner.cs	
+++ /dev/null
@@ -1,46 +0,0 @@
-using UnityEngine;
-namespace IndianOceanAssets.Engine2_5D
-{
-    // Spawns enemies at random positions and intervals
-    public class EnemySpawner : MonoBehaviour
-    {
-        [SerializeField]
-        private GameObject enemyEntity; // Enemy prefab
-
-        [SerializeField]
-        private Transform[] spawnPosition; // Possible spawn points
-
-        [SerializeField]
-        private float spawnTime = 4f; // Time between spawns
-
-        // Starts repeated spawning
-        private void Start()
-        {
-            InvokeRepeating("SpawnEnemies", 0f, spawnTime);
-        }
-
-        // Spawns a random number of enemies at random positions
-        public void SpawnEnemies()
-        {
-            int enemyNo = Random.Range(1, 4);
-
-            for (int i = 0; i < enemyNo; i++)
-            {
-                int randomSpawnPosition = Random.Range(0, spawnPosition.Length);
-
-                if (spawnPosition[randomSpawnPosition])
-                {
-                    // Randomize spawn position slightly
-                    Vector3 randomUnitCircle = new Vector3(Random.Range(-1f, 1f), .5f, Random.Range(-1f, 1f));
-                    Instantiate(enemyEntity, spawnPosition[randomSpawnPosition].position + randomUnitCircle, Quaternion.identity);
-                }
-            }
-
-            // Decrease spawn time to increase difficulty, but not below 2 seconds
-            spawnTime -= .5f;
-
-            if (spawnTime <= 2f)
-                spawnTime = 2f;
-        }
-    }
-}
\ No newline at end of file
diff --git a/unity/Assets/Scenes/Test.unity b/unity/Assets/Scenes/Test.unity
index 5893a8d..b616ffe 100644
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+++ b/unity/Assets/Scenes/Test.unity
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diff --git a/unity/Assets/eco/EchoSystem.cs b/unity/Assets/eco/EchoSystem.cs
index a48eb8f..2c1abe7 100644
--- a/unity/Assets/eco/EchoSystem.cs
+++ b/unity/Assets/eco/EchoSystem.cs
@@ -1,3 +1,4 @@
+using System;
 using UnityEngine;
 
 namespace IndianOceanAssets.Engine2_5D
@@ -18,6 +19,12 @@ namespace IndianOceanAssets.Engine2_5D
     /// </summary>
     public class EchoSystem : MonoBehaviour
     {
+        /// <summary>
+        /// 按 E 释放回声（摇铃）时触发，参数为释放时的玩家世界位置。
+        /// 敌人聆听系统等可订阅此事件。
+        /// </summary>
+        public static event Action<Vector3> OnEchoReleased;
+
         [Header("按键")]
         [SerializeField] private KeyCode echoKey = KeyCode.E;
 
@@ -105,6 +112,9 @@ namespace IndianOceanAssets.Engine2_5D
             // 记录释放时刻的玩家位置（回声中心固定，不跟随移动）
             Vector3 p = transform.position;
             _center = new Vector2(p.x, p.z);
+
+            // 通知订阅者（敌人聆听等）
+            OnEchoReleased?.Invoke(p);
         }
 
         private void UpdateExpanding()
@@ -153,4 +163,4 @@ namespace IndianOceanAssets.Engine2_5D
 
         public bool IsActive => _state != State.Idle;
     }
-}
\ No newline at end of file
+}
diff --git a/unity/Assets/enemy.meta b/unity/Assets/enemy.meta
new file mode 100644
index 0000000..1277965
--- /dev/null
+++ b/unity/Assets/enemy.meta
@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: XikWvCmlUXp3molBS0dkPpRqAmEWPxgDy8pQ05QgOF4mepv/U4Mikd0=
+folderAsset: yes
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/unity/Assets/enemy/BillboardSprite.cs b/unity/Assets/enemy/BillboardSprite.cs
new file mode 100644
index 0000000..8388d6e
--- /dev/null
+++ b/unity/Assets/enemy/BillboardSprite.cs
@@ -0,0 +1,60 @@
+using UnityEngine;
+
+namespace IndianOceanAssets.Engine2_5D
+{
+    /// <summary>
+    /// 场景物件面向摄像机脚本（饥荒风格）。
+    /// 让物体始终朝摄像机方向旋转，默认只绕 Y 轴（保持竖直不倒）。
+    ///
+    /// 用法：挂到需要面向摄像机的精灵/物件上即可。
+    /// 适合：树木、岩石、角色、道具等 2D 精灵在 3D 场景中的朝向修正。
+    /// </summary>
+    public class BillboardSprite : MonoBehaviour
+    {
+        [Tooltip("只绕Y轴旋转（饥荒风格，保持竖直不倒）。关闭则完全面向摄像机。")]
+        [SerializeField] private bool lockYAxis = true;
+
+        [Tooltip("平滑旋转（lerp过渡），关闭则瞬间转向")]
+        [SerializeField] private bool smoothRotation = false;
+
+        [Tooltip("平滑旋转速度")]
+        [SerializeField] private float rotationSpeed = 8f;
+
+        private Camera _mainCamera;
+        private Transform _camTransform;
+
+        private void Start()
+        {
+            _mainCamera = Camera.main;
+            if (_mainCamera != null)
+                _camTransform = _mainCamera.transform;
+        }
+
+        private void LateUpdate()
+        {
+            if (_camTransform == null)
+            {
+                // 摄像机丢失时重新获取（场景切换等情况）
+                _mainCamera = Camera.main;
+                if (_mainCamera != null)
+                    _camTransform = _mainCamera.transform;
+                if (_camTransform == null) return;
+            }
+
+            Vector3 dir = _camTransform.position - transform.position;
+
+            if (lockYAxis)
+                dir.y = 0f; // 保持竖直
+
+            if (dir.sqrMagnitude < 0.0001f) return;
+
+            Quaternion targetRot = Quaternion.LookRotation(dir);
+
+            if (smoothRotation)
+                transform.rotation = Quaternion.Slerp(transform.rotation, targetRot,
+                                                       rotationSpeed * Time.deltaTime);
+            else
+                transform.rotation = targetRot;
+        }
+    }
+}
diff --git a/unity/Assets/2.5D Engine/Scripts/EnemySpawner.cs.meta b/unity/Assets/enemy/BillboardSprite.cs.meta
similarity index 76%
rename from unity/Assets/2.5D Engine/Scripts/EnemySpawner.cs.meta
rename to unity/Assets/enemy/BillboardSprite.cs.meta
index 61c1acb..e1e31ff 100644
--- a/unity/Assets/2.5D Engine/Scripts/EnemySpawner.cs.meta	
+++ b/unity/Assets/enemy/BillboardSprite.cs.meta
@@ -1,5 +1,5 @@
 fileFormatVersion: 2
-guid: c755496b98cf3a743b854c203125bdff
+guid: BnwZsH+oBX9o8/qrlvnDZyZeLvCxOPjzKkntbYOjVXovzGFc2g6PBfk=
 MonoImporter:
   externalObjects: {}
   serializedVersion: 2
diff --git a/unity/Assets/enemy/EnemyAI.cs b/unity/Assets/enemy/EnemyAI.cs
new file mode 100644
index 0000000..ff1e0e9
--- /dev/null
+++ b/unity/Assets/enemy/EnemyAI.cs
@@ -0,0 +1,222 @@
+using UnityEngine;
+
+namespace IndianOceanAssets.Engine2_5D
+{
+    /// <summary>
+    /// 敌人AI —— 检测/追击/脱离持续/摇铃聆听响应。
+    ///
+    /// 状态流程：
+    /// - Idle：站岗。主角进入 detectionRange → Chasing
+    /// - Chasing：追击主角。主角离开 detectionRange → ChasingPersist
+    /// - ChasingPersist：脱离后继续追击 chasePersistTime 秒。
+    ///   主角重新进入范围 → 回到 Chasing；超时 → Idle（停在当前位置，不回出生点）
+    /// - BellResponding：主角在 listenRange 内按E摇铃时触发，
+    ///   朝主角方向移动 bellMoveTime 秒（距离 = 速度 × 时间），然后停下 → Idle
+    ///
+    /// 挂载位置：敌人预制体上
+    /// 需要：场景中有 EchoSystem（用于摇铃事件）、玩家物体带 "Player" 标签
+    ///       （或手动把玩家拖到 playerTarget 字段）
+    /// </summary>
+    public class EnemyAI : MonoBehaviour
+    {
+        [Header("目标")]
+        [Tooltip("玩家目标（留空则自动查找 Player 标签）")]
+        [SerializeField] private Transform playerTarget;
+
+        [Header("检测与追击")]
+        [Tooltip("发现主角的范围")]
+        [SerializeField] private float detectionRange = 8f;
+
+        [Tooltip("追击速度")]
+        [SerializeField] private float chaseSpeed = 3f;
+
+        [Tooltip("靠近主角到此距离时停下")]
+        [SerializeField] private float stopDistance = 1.2f;
+
+        [Tooltip("主角脱离检测范围后，继续追击的时间（秒）")]
+        [SerializeField] private float chasePersistTime = 3f;
+
+        [Header("聆听（摇铃响应）")]
+        [Tooltip("聆听范围：主角在此范围内按E摇铃时，敌人会朝主角方向移动")]
+        [SerializeField] private float listenRange = 15f;
+
+        [Tooltip("摇铃响应移动速度")]
+        [SerializeField] private float bellMoveSpeed = 4f;
+
+        [Tooltip("摇铃响应移动时间（距离 = 速度 × 时间）")]
+        [SerializeField] private float bellMoveTime = 1.5f;
+
+        private enum State { Idle, Chasing, ChasingPersist, BellResponding }
+        private State _state = State.Idle;
+        private float _stateTimer;
+        private Vector3 _bellDirection;
+
+        private void Start()
+        {
+            if (playerTarget == null)
+            {
+                var player = GameObject.FindWithTag("Player");
+                if (player != null)
+                    playerTarget = player.transform;
+            }
+        }
+
+        private void OnEnable()
+        {
+            EchoSystem.OnEchoReleased += OnBell;
+        }
+
+        private void OnDisable()
+        {
+            EchoSystem.OnEchoReleased -= OnBell;
+        }
+
+        private void Update()
+        {
+            switch (_state)
+            {
+                case State.Idle:           UpdateIdle();           break;
+                case State.Chasing:        UpdateChasing();        break;
+                case State.ChasingPersist: UpdateChasingPersist(); break;
+                case State.BellResponding: UpdateBellResponding(); break;
+            }
+        }
+
+        // ===== Idle：站岗，等主角进入检测范围 =====
+        private void UpdateIdle()
+        {
+            if (playerTarget == null) return;
+            if (XZDistance(transform.position, playerTarget.position) <= detectionRange)
+            {
+                _state = State.Chasing;
+            }
+        }
+
+        // ===== Chasing：追击主角 =====
+        private void UpdateChasing()
+        {
+            if (playerTarget == null) return;
+            float dist = XZDistance(transform.position, playerTarget.position);
+
+            // 主角脱离检测范围 → 继续追击一段时间
+            if (dist > detectionRange)
+            {
+                _state = State.ChasingPersist;
+                _stateTimer = chasePersistTime;
+                return;
+            }
+
+            // 靠近到停止距离时停下（但仍处于追击状态）
+            if (dist > stopDistance)
+                MoveToward(playerTarget.position, chaseSpeed);
+        }
+
+        // ===== ChasingPersist：脱离后继续追击，倒计时 =====
+        private void UpdateChasingPersist()
+        {
+            if (playerTarget == null) return;
+            _stateTimer -= Time.deltaTime;
+
+            // 超时 → 停在当前位置，回到 Idle（不回出生点）
+            if (_stateTimer <= 0f)
+            {
+                _state = State.Idle;
+                return;
+            }
+
+            float dist = XZDistance(transform.position, playerTarget.position);
+
+            // 主角重新进入检测范围 → 回到正常追击
+            if (dist <= detectionRange)
+            {
+                _state = State.Chasing;
+                return;
+            }
+
+            if (dist > stopDistance)
+                MoveToward(playerTarget.position, chaseSpeed);
+        }
+
+        // ===== BellResponding：摇铃响应，朝主角方向移动固定时间 =====
+        private void UpdateBellResponding()
+        {
+            _stateTimer -= Time.deltaTime;
+            if (_stateTimer <= 0f)
+            {
+                _state = State.Idle;
+                return;
+            }
+            // 沿摇铃时刻的方向移动（距离 = 速度 × 时间）
+            Vector3 move = _bellDirection * bellMoveSpeed * Time.deltaTime;
+            transform.position += new Vector3(move.x, 0f, move.z);
+        }
+
+        // ===== 摇铃事件回调（由 EchoSystem.OnEchoReleased 触发）=====
+        private void OnBell(Vector3 bellPos)
+        {
+            if (playerTarget == null) return;
+
+            // 只有在聆听范围内才响应
+            if (XZDistance(transform.position, bellPos) > listenRange) return;
+
+            // 计算朝主角方向（摇铃时刻的位置）
+            _bellDirection = new Vector3(
+                bellPos.x - transform.position.x,
+                0f,
+                bellPos.z - transform.position.z
+            );
+            if (_bellDirection.sqrMagnitude > 0.001f)
+                _bellDirection.Normalize();
+            else
+                _bellDirection = transform.forward; // 重叠时用当前朝向
+
+            // 摇铃响应可打断任何当前状态
+            _state = State.BellResponding;
+            _stateTimer = bellMoveTime;
+        }
+
+        // ===== 工具方法 =====
+
+        private void MoveToward(Vector3 target, float speed)
+        {
+            Vector3 dir = new Vector3(
+                target.x - transform.position.x,
+                0f,
+                target.z - transform.position.z
+            );
+            float dist = dir.magnitude;
+            if (dist < 0.01f) return;
+
+            dir /= dist;
+            Vector3 move = dir * speed * Time.deltaTime;
+            if (move.magnitude > dist) move = dir * dist; // 不越过目标
+            transform.position += new Vector3(move.x, 0f, move.z);
+        }
+
+        private float XZDistance(Vector3 a, Vector3 b)
+        {
+            float dx = a.x - b.x;
+            float dz = a.z - b.z;
+            return Mathf.Sqrt(dx * dx + dz * dz);
+        }
+
+        // ===== 编辑器可视化 =====
+        private void OnDrawGizmosSelected()
+        {
+            // 检测范围（黄色）
+            Gizmos.color = new Color(1f, 0.85f, 0f, 0.6f);
+            Gizmos.DrawWireSphere(transform.position, detectionRange);
+
+            // 聆听范围（青色）
+            Gizmos.color = new Color(0f, 0.85f, 1f, 0.6f);
+            Gizmos.DrawWireSphere(transform.position, listenRange);
+
+            // 停止距离（红色）
+            Gizmos.color = new Color(1f, 0.3f, 0.3f, 0.6f);
+            Gizmos.DrawWireSphere(transform.position, stopDistance);
+        }
+
+        /// <summary>当前状态（调试用）</summary>
+        public string CurrentState => _state.ToString();
+    }
+}
diff --git a/unity/Assets/2.5D Engine/Scripts/EnemyAI.cs.meta b/unity/Assets/enemy/EnemyAI.cs.meta
similarity index 76%
rename from unity/Assets/2.5D Engine/Scripts/EnemyAI.cs.meta
rename to unity/Assets/enemy/EnemyAI.cs.meta
index 3da34b7..ec308ad 100644
--- a/unity/Assets/2.5D Engine/Scripts/EnemyAI.cs.meta	
+++ b/unity/Assets/enemy/EnemyAI.cs.meta
@@ -1,5 +1,5 @@
 fileFormatVersion: 2
-guid: 04126beb49efb8c49a7ecc822750a0c7
+guid: CCwWtXv+BXlMo6hf6dmE2xTAlfSRx2PCnRzyAU6iQWgz40mcEU424HU=
 MonoImporter:
   externalObjects: {}
   serializedVersion: 2
diff --git a/unity/Assets/enemy/EnemyManager.cs b/unity/Assets/enemy/EnemyManager.cs
new file mode 100644
index 0000000..8ecae5f
--- /dev/null
+++ b/unity/Assets/enemy/EnemyManager.cs
@@ -0,0 +1,85 @@
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace IndianOceanAssets.Engine2_5D
+{
+    /// <summary>
+    /// 敌人管理器 —— 在游戏开始时，于场景中所有 EnemySpawnPoint 处生成敌人。
+    ///
+    /// 用法：
+    /// 1. 在场景中放置空物体，挂 EnemySpawnPoint 组件，作为出生点
+    /// 2. 在场景中创建空物体，挂此 EnemyManager 脚本
+    /// 3. 把敌人预制体拖到 enemyPrefab 字段
+    /// 4. 运行时自动在所有出生点生成敌人
+    /// </summary>
+    public class EnemyManager : MonoBehaviour
+    {
+        public static EnemyManager Instance { get; private set; }
+
+        [Header("敌人物体预制体")]
+        [SerializeField] private GameObject enemyPrefab;
+
+        [Tooltip("勾选后游戏开始时自动在所有出生点生成敌人")]
+        [SerializeField] private bool spawnOnStart = true;
+
+        private readonly List<EnemyAI> _enemies = new List<EnemyAI>();
+
+        private void Awake()
+        {
+            if (Instance != null && Instance != this)
+            {
+                Destroy(this);
+                return;
+            }
+            Instance = this;
+        }
+
+        private void Start()
+        {
+            if (spawnOnStart)
+                SpawnAll();
+        }
+
+        /// <summary>
+        /// 在所有 EnemySpawnPoint 处生成敌人
+        /// </summary>
+        [ContextMenu("Spawn All")]
+        public void SpawnAll()
+        {
+            var spawnPoints = FindObjectsByType<EnemySpawnPoint>(FindObjectsSortMode.None);
+            foreach (var sp in spawnPoints)
+            {
+                SpawnEnemy(sp.transform.position, sp.transform.rotation);
+            }
+            Debug.Log($"[EnemyManager] 在 {spawnPoints.Length} 个出生点生成了 {_enemies.Count} 个敌人");
+        }
+
+        /// <summary>
+        /// 在指定位置生成一个敌人
+        /// </summary>
+        public GameObject SpawnEnemy(Vector3 position, Quaternion rotation)
+        {
+            if (enemyPrefab == null)
+            {
+                Debug.LogWarning("[EnemyManager] enemyPrefab 未设置！");
+                return null;
+            }
+
+            var enemy = Instantiate(enemyPrefab, position, rotation);
+            var ai = enemy.GetComponent<EnemyAI>();
+            if (ai != null && !_enemies.Contains(ai))
+                _enemies.Add(ai);
+
+            return enemy;
+        }
+
+        /// <summary>
+        /// 获取所有活跃敌人（自动清理已销毁的）
+        /// </summary>
+        public List<EnemyAI> GetActiveEnemies()
+        {
+            _enemies.RemoveAll(e => e == null);
+            return _enemies;
+        }
+    }
+}
diff --git a/unity/Assets/enemy/EnemyManager.cs.meta b/unity/Assets/enemy/EnemyManager.cs.meta
new file mode 100644
index 0000000..1e5f9bc
--- /dev/null
+++ b/unity/Assets/enemy/EnemyManager.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: BigZtSusUX7LyMDm+vuceZYAyL3PPYdY87jCezHOaujUlI0euVs5iBo=
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diff --git a/unity/Assets/enemy/EnemySpawnPoint.cs b/unity/Assets/enemy/EnemySpawnPoint.cs
new file mode 100644
index 0000000..25ab238
--- /dev/null
+++ b/unity/Assets/enemy/EnemySpawnPoint.cs
@@ -0,0 +1,24 @@
+using UnityEngine;
+
+namespace IndianOceanAssets.Engine2_5D
+{
+    /// <summary>
+    /// 敌人出生点标记 —— 挂到场景中的空物体上，标记敌人出生位置。
+    /// EnemyManager 会在游戏开始时找到所有出生点并生成敌人。
+    ///
+    /// 用法：在场景中放置空物体，挂上此组件，调整位置即可。
+    /// Scene 视图中显示红色线框球 + 竖线，方便辨认。
+    /// </summary>
+    public class EnemySpawnPoint : MonoBehaviour
+    {
+        [Tooltip("Gizmo 球体半径（仅编辑器可视化）")]
+        [SerializeField] private float gizmoRadius = 0.5f;
+
+        private void OnDrawGizmos()
+        {
+            Gizmos.color = Color.red;
+            Gizmos.DrawWireSphere(transform.position, gizmoRadius);
+            Gizmos.DrawLine(transform.position, transform.position + Vector3.up * 2f);
+        }
+    }
+}
diff --git a/unity/Assets/enemy/EnemySpawnPoint.cs.meta b/unity/Assets/enemy/EnemySpawnPoint.cs.meta
new file mode 100644
index 0000000..526b4d3
--- /dev/null
+++ b/unity/Assets/enemy/EnemySpawnPoint.cs.meta
@@ -0,0 +1,11 @@
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diff --git a/unity/UserSettings/EditorUserSettings.asset b/unity/UserSettings/EditorUserSettings.asset
index 344b50f..11ddbd8 100644
--- a/unity/UserSettings/EditorUserSettings.asset
+++ b/unity/UserSettings/EditorUserSettings.asset
@@ -18,10 +18,10 @@ EditorUserSettings:
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     RecentlyUsedSceneGuid-5:
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+      value: 5055070050010c5a0e5d0d27497a0e441016412c2f7d206178714f61b3b8326b
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