diff --git a/src/EcsGroup.cs b/src/EcsGroup.cs
index 657c816..17082e9 100644
--- a/src/EcsGroup.cs
+++ b/src/EcsGroup.cs
@@ -246,7 +246,7 @@ namespace DCFApixels.DragonECS
         #endregion
 
         #region Enumerator
-        public struct Enumerator : IDisposable
+        public ref struct Enumerator
         {
             private readonly EcsGroup _source;
             private readonly int[] _dense;
diff --git a/src/EcsTable.cs b/src/EcsTable.cs
index 469070a..7fb53f3 100644
--- a/src/EcsTable.cs
+++ b/src/EcsTable.cs
@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Runtime.CompilerServices;
 using System.Text;
 using System.Threading.Tasks;
 
@@ -11,8 +12,9 @@ namespace DCFApixels.DragonECS
         private IEcsPool[] _pools;
         private EcsNullPool _nullPool;
 
-        private int[] _denseEntities;
-        private int[] _sparceEntities;
+        private short[] _gens;
+        private short[] _componentCounts;
+
         private int _entitiesCount;
 
         private List<EcsQueryBase>[] _filtersByIncludedComponents;
@@ -22,12 +24,42 @@ namespace DCFApixels.DragonECS
 
         private List<EcsGroup> _groups;
 
-        #region Internal Properties
+
+        #region Properties
         public int Count => _entitiesCount;
-        public int Capacity => _denseEntities.Length;
+        public int Capacity => _gens.Length;
+        public ReadOnlySpan<IEcsPool> GetAllPools() => new ReadOnlySpan<IEcsPool>(_pools);
+        #endregion
+
+        #region internal Add/Has/Remove
+        internal void Add(int entityID)
+        {
+            int entity;
+            if (_entitiesCount >= _gens.Length)
+            {
+                Array.Resize(ref _gens, _gens.Length << 1);
+                Array.Resize(ref _componentCounts, _componentCounts.Length << 1);
+            }
+            _gens[_entitiesCount++]++;
+            _componentCounts[_entitiesCount++] = 0;
+
+            // if (_gens.Length <= entityID)
+            // {
+            //     //TODO есть проблема что если передать слишком большой id такой алогоритм не сработает
+            // }
+
+
+        }
+        internal void Has(int entityID)
+        {
+
+        }
+        internal void Remove(int entityID)
+        {
+
+        }
         #endregion
 
-        public ReadOnlySpan<IEcsPool> GetAllPools() => new ReadOnlySpan<IEcsPool>(_pools);
         //public int GetComponentID<T>() => ;
     }
 
diff --git a/src/EcsWorld.cs b/src/EcsWorld.cs
index abf2751..ca2689b 100644
--- a/src/EcsWorld.cs
+++ b/src/EcsWorld.cs
@@ -3,7 +3,6 @@ using System;
 using System.Collections.Generic;
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
-using System.Transactions;
 
 namespace DCFApixels.DragonECS
 {