diff --git a/Assets/Resources/Prefabs/UI/PRF_TreeItem.prefab b/Assets/Resources/Prefabs/UI/PRF_TreeItem.prefab
new file mode 100644
index 00000000..9586518c
--- /dev/null
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+  m_Script: {fileID: 11500000, guid: fe87c0e1cc204ed48ad3b37840f39efc, type: 3}
+  m_Name: 
+  m_EditorClassIdentifier: 
+  m_Material: {fileID: 0}
+  m_Color: {r: 1, g: 1, b: 1, a: 0}
+  m_RaycastTarget: 1
+  m_RaycastPadding: {x: 0, y: 0, z: 0, w: 0}
+  m_Maskable: 1
+  m_OnCullStateChanged:
+    m_PersistentCalls:
+      m_Calls: []
+  m_Sprite: {fileID: 10905, guid: 0000000000000000f000000000000000, type: 0}
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+  m_FillOrigin: 0
+  m_UseSpriteMesh: 0
+  m_PixelsPerUnitMultiplier: 1
diff --git a/Assets/Resources/Prefabs/UI/PRF_TreeItem.prefab.meta b/Assets/Resources/Prefabs/UI/PRF_TreeItem.prefab.meta
new file mode 100644
index 00000000..6562acf2
--- /dev/null
+++ b/Assets/Resources/Prefabs/UI/PRF_TreeItem.prefab.meta
@@ -0,0 +1,7 @@
+fileFormatVersion: 2
+guid: 9864e9f028e578f44a4f6f29cbe44ae0
+PrefabImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/legacy.meta b/Assets/legacy.meta
new file mode 100644
index 00000000..3c482a43
--- /dev/null
+++ b/Assets/legacy.meta
@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: c04ed7ceb0169454a8af4113cec522c4
+folderAsset: yes
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/legacy/Scripts.meta b/Assets/legacy/Scripts.meta
new file mode 100644
index 00000000..924e16e6
--- /dev/null
+++ b/Assets/legacy/Scripts.meta
@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: a7c7d3c156415e34fa2a225d94bbca75
+folderAsset: yes
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/legacy/Scripts/HierarchyTree.cs b/Assets/legacy/Scripts/HierarchyTree.cs
new file mode 100644
index 00000000..b45ec237
--- /dev/null
+++ b/Assets/legacy/Scripts/HierarchyTree.cs
@@ -0,0 +1,194 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using UnityEngine;
+using UnityEngine.PlayerLoop;
+using XRLib;
+
+namespace XED
+{
+    public class HierarchyTree : MonoBehaviour, ISingle
+    {
+        public event Action<TreeItem_> onAddEvent;
+        public event Action<TreeItem_> onSelectEvent;
+        public event Action<TwinObject> onRemoveEvent;
+        public event Action<TreeItem_> onDeselectEvent;
+        public event Action<List<TreeItem_>> onDataUpdate;
+
+        HashSet<TreeItem_> tempHashSet = new();
+        
+        HashSet<TwinObject> rootObjects = new();
+        List<TreeItem_> data = new List<TreeItem_>();
+        Dictionary<TwinObject, TreeItem_> twinToItem = new Dictionary<TwinObject, TreeItem_>();
+
+        TreeItem_ CreateItem(TwinObject to)
+        {
+            TreeItem_ item = new TreeItem_(to);
+            data.Add(item);
+            twinToItem.Add(to, item);
+            return item;
+        }
+
+        public bool isExist(TwinObject to)
+        {
+            return rootObjects.Contains(to);
+        }
+
+        public void Add(TwinObject to)
+        {
+            if (!rootObjects.Add(to))
+                return;
+         
+            if (to is Wall)
+                return;
+
+            var item = CreateItem(to);
+            onAddEvent?.Invoke(item);
+        }
+
+        public void Remove(TwinObject to)
+        {
+            if (!rootObjects.Contains(to))
+            {
+                return;
+            }
+            GetChilds(twinToItem[to]);
+            foreach (var item in tempHashSet)
+            {
+                switch (item.ToItem)
+                {
+                    case WallGroup wg:
+                        foreach (var items in wg.groupWalls)
+                        {
+                            rootObjects.Remove(items);
+                        }
+                        rootObjects.Remove(wg);
+                        break;
+                    default:
+                        rootObjects.Remove(item.ToItem);
+                        break;
+                }
+                item.parent?.RemoveChild(item);
+                onRemoveEvent?.Invoke(item.ToItem);
+                item.DestroyTreeItem();
+                data.Remove(item);
+                twinToItem.Remove(item.ToItem);
+                Destroy(item.ToItem.gameObject);
+            }
+            tempHashSet.Clear();
+            onDataUpdate(data);
+        }
+
+        void GetChilds(TreeItem_ go)
+        {
+            tempHashSet.Add(go);
+            foreach (var c in go.children)
+            {
+                GetChilds(c);
+            }
+        }
+
+        public void Attach(TreeItem_ p, TreeItem_ t)
+        {
+            if (!data.Contains(p))
+            {
+                Debug.LogError("Parent not found");
+                return;
+            }
+            if (!data.Contains(t))
+            {
+                Debug.LogError("Child not found");
+                return;
+            }
+            if (p == t)
+            {
+                return;
+            }
+            GetChilds(t);
+            foreach (var item in tempHashSet)
+            {
+                if (p.parent == item)
+                {
+                    Debug.LogError("It is infinite");
+                    tempHashSet.Clear();
+                    return;
+                }
+            }
+
+            t.parent?.RemoveChild(t);
+            p.Add(t);
+            t.parent = p;
+            data.Remove(t);
+            var index = data.IndexOf(p) + 1;
+            if (index >= data.Count)
+            {
+                if (tempHashSet.Count > 1)
+                {
+                    foreach (var item in tempHashSet)
+                    {
+                        data?.Remove(item);
+                        data.Add(item);
+                    }
+                }
+                else
+                {
+                    data.Add(t);
+                }
+            }
+            else
+            {
+                int i = 0;
+                if (tempHashSet.Count > 1)
+                {
+                    foreach (var item in tempHashSet)
+                    {
+                        data?.Remove(item);
+                        data.Insert(index + i, item);
+                        i++;
+                    }
+                }
+                else
+                {
+                    data.Insert(index, t);
+                }
+            }
+            tempHashSet.Clear();
+            onDataUpdate(data);
+        }
+
+        public void Dettach(TreeItem_ item)
+        {
+            if (!data.Contains(item))
+            {
+                Debug.LogError("Not found");
+                return;
+            }
+
+            item.parent?.RemoveChild(item);
+            item.parent = null;
+            GetChilds(item);
+            foreach (var i in tempHashSet)
+            {
+                data?.Remove(i);
+                data.Add(i);
+            }
+            tempHashSet.Clear();
+            onDataUpdate(data);
+        }
+
+        internal void Select(TwinObject to)
+        {
+            onSelectEvent?.Invoke(twinToItem[to]);
+        }
+
+        public void Select(TreeItem_ ti)
+        {
+            onSelectEvent?.Invoke(ti);
+        }
+
+        internal void Deselect(TwinObject to)
+        {
+            onDeselectEvent?.Invoke(twinToItem[to]);
+        }
+    }
+}
diff --git a/Assets/legacy/Scripts/HierarchyTree.cs.meta b/Assets/legacy/Scripts/HierarchyTree.cs.meta
new file mode 100644
index 00000000..df09761e
--- /dev/null
+++ b/Assets/legacy/Scripts/HierarchyTree.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 400f59e21429ab5409c7c43eef737e6f
\ No newline at end of file
diff --git a/Assets/legacy/Scripts/Panel_Hierarchy.cs b/Assets/legacy/Scripts/Panel_Hierarchy.cs
new file mode 100644
index 00000000..a9983317
--- /dev/null
+++ b/Assets/legacy/Scripts/Panel_Hierarchy.cs
@@ -0,0 +1,195 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.InteropServices.Expando;
+using System.Security.Cryptography;
+using UnityEngine;
+using UnityEngine.EventSystems;
+using UnityEngine.SubsystemsImplementation;
+using UnityEngine.UI;
+using XRLib;
+using XRLib.UI;
+using XED.UI;
+
+namespace XED
+{
+    public class Panel_Hierarchy : PanelBase,IDropHandler
+    {
+        public ScrollRect scrollrect_hierarchycontent;
+        public UI_HierarchyItem prf_hierarchyitem;
+        
+        internal Action<TwinObject> onClickItem;
+        internal Action<TreeItem_> onItemDrop;
+        internal Action<TreeItem_, TreeItem_> OnItemDropOnItem;
+        
+        private Dictionary<TreeItem_, UI_HierarchyItem> itemToView = new();
+        private Dictionary<UI_HierarchyItem, TreeItem_> viewToItem = new();
+        HashSet<TreeItem_> tempHashSet = new();
+
+        public float tap = 30f;
+
+        enum AnimationParameter
+        {
+            Contract
+        }
+
+        public override void AfterAwake()
+        {
+            prf_hierarchyitem = Resources.Load<UI_HierarchyItem>("Prefabs/UI/PRF_TreeItem");
+        }
+
+        public void OnDrop(PointerEventData eventData)
+        {
+            if (eventData.pointerDrag != null)
+            {
+                UI_HierarchyItem draggeditem = eventData.pointerDrag.GetComponent<UI_HierarchyItem>();
+                if (draggeditem)
+                {
+                    var item = viewToItem[draggeditem];
+                    onItemDrop(item);
+                }
+            }
+        }
+
+        void HierarchyExpand(bool value)
+        {
+            GetComponent<Animator>().SetBool(AnimationParameter.Contract.ToString(), value);
+        }
+
+        public void AddItem(TreeItem_ item)
+        {
+            UI_HierarchyItem itemView = Instantiate(prf_hierarchyitem, scrollrect_hierarchycontent.content);
+            item.onExpand += Expand;
+            item.onFold += Fold;
+            itemView.Set(item);
+            itemView.onDestroy += RemoveItem;
+            itemView.onClick += OnClickItem;
+
+            UI_DragDrop_ ui_DragDrop = itemView.transform.GetComponent<UI_DragDrop_>();
+            ui_DragDrop.OnDropItem += ItemDrop;
+
+            viewToItem.Add(itemView, item);
+            itemToView.Add(item, itemView);
+        }
+
+        void ItemDrop(UIBase parent, UIBase child)
+        {
+            if(parent is UI_HierarchyItem parentItem && child is UI_HierarchyItem childItem)
+            {
+                var pi = viewToItem[parentItem];
+                var ci = viewToItem[childItem];
+                OnItemDropOnItem(pi, ci);
+            }
+        }
+
+        void Expand(TreeItem_ item)
+        {
+            var rootChildren = item.children;
+            for (int i = 0; i < rootChildren.Count; ++i)
+            {
+                var rootChild = item.children[i];
+                tempHashSet.Add(rootChild);
+
+                if (!rootChild.expanded)
+                {
+                    continue;
+                }
+
+                var rootChildItem = rootChild;
+                for (int j = 0; j < rootChildItem.children.Count; ++j)
+                {
+                    var leafChild = rootChildItem.children[j];
+                    GetExpandTargets(leafChild);
+                }
+            }
+            foreach (var r in tempHashSet)
+            {
+                
+                itemToView[r].gameObject.SetActive(true);
+            }
+            tempHashSet.Clear();
+        }
+
+        void GetExpandTargets(TreeItem_ i)
+        {
+            tempHashSet.Add(i);
+            if (!i.expanded)
+            {
+                return;
+            }
+
+            var children = i.children;
+            foreach (var item in children)
+            {
+                tempHashSet.Add(item);
+                GetExpandTargets(item);
+            }
+        }
+
+        void Fold(TreeItem_ item)
+        {
+            GetFoldTargets(item);
+            foreach (var r in tempHashSet)
+            {
+                var view = itemToView[r];
+                view.SetActive(false);
+            }
+            tempHashSet.Clear();
+        }
+
+        void GetFoldTargets(TreeItem_ i)
+        {
+            var children = i.children;
+            foreach (var item in children)
+            {
+                if (itemToView[i].gameObject.activeSelf)
+                {
+                    tempHashSet.Add(item);
+                    GetFoldTargets(item);
+                }
+            }
+        }
+
+        public void ActiveHighlightItem(TreeItem_ item)
+        {
+            if (itemToView.ContainsKey(item))
+            {
+                itemToView[item].ActiveHighlight();
+            }
+        }
+
+        public void DeactiveHighlightItem(TreeItem_ item)
+        {
+            if (itemToView.ContainsKey(item))
+            {
+                itemToView[item].DeactvieHighlight();
+            }
+        }
+
+        public void UpdateIndex(List<TreeItem_> data)
+        {
+            for(int i = 0; i < data.Count; i++)
+            {
+                var item = data[i];
+                var view = itemToView[item];
+                var depth = data[i].depth;
+                view.transform.SetSiblingIndex(i);
+                var TapRectTransform = view.transform.GetChild(0).GetComponentInChildren<RectTransform>(true);
+                TapRectTransform.offsetMin = new Vector2(depth * tap, TapRectTransform.offsetMin.y);
+
+            }
+        }
+
+        void OnClickItem(UI_HierarchyItem view)
+        {
+            var item = viewToItem[view];
+            onClickItem?.Invoke(item.ToItem);
+        }
+
+        public void RemoveItem(UI_HierarchyItem to)
+        {
+            itemToView.Remove(viewToItem[to]);
+            viewToItem.Remove(to);
+        }
+    }
+}
diff --git a/Assets/legacy/Scripts/Panel_Hierarchy.cs.meta b/Assets/legacy/Scripts/Panel_Hierarchy.cs.meta
new file mode 100644
index 00000000..99e910ee
--- /dev/null
+++ b/Assets/legacy/Scripts/Panel_Hierarchy.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 39734de062d30454a9ebdbf748af07ca
\ No newline at end of file
diff --git a/Assets/legacy/Scripts/Tester.cs b/Assets/legacy/Scripts/Tester.cs
new file mode 100644
index 00000000..2ddde659
--- /dev/null
+++ b/Assets/legacy/Scripts/Tester.cs
@@ -0,0 +1,34 @@
+using UnityEngine;
+
+namespace XED
+{
+    public class Tester : MonoBehaviour
+    {
+        Panel_Hierarchy ph;
+        HierarchyTree ht;
+        GameObject renderObjectPrefab;
+        // Start is called once before the first execution of Update after the MonoBehaviour is created
+        void Start()
+        {
+            ph=FindObjectOfType<Panel_Hierarchy>();
+            ht = FindObjectOfType<HierarchyTree>();
+            ht.onAddEvent += ph.AddItem;
+            ph.OnItemDropOnItem += ht.Attach;
+            ht.onDataUpdate += ph.UpdateIndex;
+            ph.onItemDrop += ht.Dettach;
+            renderObjectPrefab = Resources.Load<GameObject>("Prefabs/PRF_RenderObject");
+        }
+
+        // Update is called once per frame
+        void Update()
+        {
+            if (Input.GetKeyDown(KeyCode.A))
+            {
+                var obj = Instantiate(renderObjectPrefab);
+                var to = obj.GetComponent<TwinObject>();
+                to.name = to.name.Replace("(Clone)", "");
+                ht.Add(to);
+            }
+        }
+    }
+}
diff --git a/Assets/legacy/Scripts/Tester.cs.meta b/Assets/legacy/Scripts/Tester.cs.meta
new file mode 100644
index 00000000..836b206f
--- /dev/null
+++ b/Assets/legacy/Scripts/Tester.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 2f7ab64367eb074498afe02ab1069901
\ No newline at end of file
diff --git a/Assets/legacy/Scripts/TreeItem_.cs b/Assets/legacy/Scripts/TreeItem_.cs
new file mode 100644
index 00000000..1ab6a003
--- /dev/null
+++ b/Assets/legacy/Scripts/TreeItem_.cs
@@ -0,0 +1,63 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace XED
+{
+    public class TreeItem_
+    {
+        public TwinObject ToItem;
+        //public UI_HierarchyItem View;
+        public event Action OnDestroyTreeItem;
+
+        public int depth
+        {
+            get
+            {
+                TreeItem_ curr = parent;
+                int result = 0;
+                while (curr != null)
+                {
+                    result++;
+                    curr = curr.parent;
+                }
+                return result;
+            }
+        }
+        public List<TreeItem_> children = new List<TreeItem_>();
+        public TreeItem_ parent;
+        public bool expanded = true;
+        public event Action<TreeItem_> onExpand;
+        public event Action<TreeItem_> onFold;
+
+        public TreeItem_(TwinObject to)
+        {
+            ToItem = to;
+        }
+
+        internal void Add(TreeItem_ t)
+        {
+            children.Add(t);
+        }
+
+        internal void RemoveChild(TreeItem_ c)
+        {
+            children.Remove(c);
+        }
+
+        public void OnExpand(bool value)
+        {
+            expanded = value;
+            if (value)
+                onExpand?.Invoke(this);
+            else
+                onFold?.Invoke(this);
+        }
+
+        public void DestroyTreeItem()
+        {
+            OnDestroyTreeItem?.Invoke();
+        }
+    }
+}
diff --git a/Assets/legacy/Scripts/TreeItem_.cs.meta b/Assets/legacy/Scripts/TreeItem_.cs.meta
new file mode 100644
index 00000000..b5bbe7b2
--- /dev/null
+++ b/Assets/legacy/Scripts/TreeItem_.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 77ba20c023097c043a1b8a635d780135
\ No newline at end of file
diff --git a/Assets/legacy/Scripts/UI_DragDrop_.cs b/Assets/legacy/Scripts/UI_DragDrop_.cs
new file mode 100644
index 00000000..682449c0
--- /dev/null
+++ b/Assets/legacy/Scripts/UI_DragDrop_.cs
@@ -0,0 +1,47 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.EventSystems;
+using UnityEngine.UI;
+using XRLib.UI;
+
+namespace XED
+{
+    public class UI_DragDrop_ : MonoBehaviour,IBeginDragHandler,IDragHandler,IEndDragHandler,IDropHandler
+    {
+        GameObject Clone;
+        public float cloneAlpha=1f;
+        public Action<UIBase, UIBase> OnDropItem;
+        public void OnBeginDrag(PointerEventData eventData)
+        {
+            Clone=Instantiate(gameObject,gameObject.transform.parent);
+            Clone.GetComponent<CanvasGroup>().blocksRaycasts = false;
+            var CI = Clone.GetComponentsInChildren<Image>();
+            foreach(var c in CI)
+            {
+                c.color = new Color(c.color.r, c.color.g, c.color.b, cloneAlpha);
+            }
+        }
+        public void OnDrag(PointerEventData eventData)
+        {
+            Clone.transform.position = Input.mousePosition;
+        }
+        public void OnEndDrag(PointerEventData eventData)
+        {
+            Destroy(Clone);
+        }
+
+        public void OnDrop(PointerEventData eventData)
+        {
+            if (eventData.pointerDrag != null)
+            {
+                UI_DragDrop_ draggedItem = eventData.pointerDrag.GetComponent<UI_DragDrop_>();
+                if (draggedItem)
+                {
+                    OnDropItem?.Invoke(gameObject.GetComponent<UIBase>(), draggedItem.GetComponent<UIBase>());
+                }
+            }
+        }
+    }
+}
diff --git a/Assets/legacy/Scripts/UI_DragDrop_.cs.meta b/Assets/legacy/Scripts/UI_DragDrop_.cs.meta
new file mode 100644
index 00000000..3418feac
--- /dev/null
+++ b/Assets/legacy/Scripts/UI_DragDrop_.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 9e3cc64011e8dbe428cf3fe9304f9a9a
\ No newline at end of file
diff --git a/Assets/legacy/Scripts/UI_HierarchyItem.cs b/Assets/legacy/Scripts/UI_HierarchyItem.cs
new file mode 100644
index 00000000..3dbf30b5
--- /dev/null
+++ b/Assets/legacy/Scripts/UI_HierarchyItem.cs
@@ -0,0 +1,68 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using TMPro;
+using UnityEngine;
+using UnityEngine.UI;
+using XRLib;
+using XRLib.UI;
+
+namespace XED
+{
+    public class UI_HierarchyItem : UIBase
+    {
+        public Button button_selectitem;
+        public event Action<UI_HierarchyItem> onClick;
+        public event Action<UI_HierarchyItem> onDestroy;
+
+
+        // Start is called before the first frame update
+        public void Set(TreeItem_ Treeitem)
+        {
+            var item = Treeitem;
+            var toitem = Treeitem.ToItem;
+            item.OnDestroyTreeItem += DestroyItemView;
+
+            TextMeshProUGUI text_name = Find<TextMeshProUGUI>(nameof(text_name));
+            text_name.SetText(toitem.name);
+
+            Toggle toggle_display = Find<Toggle>(nameof(toggle_display));
+            toggle_display.onValueChanged.AddListener(toitem.SetDisplayable);
+
+            Toggle toggle_interactible = Find<Toggle>(nameof(toggle_interactible));
+            toggle_interactible.onValueChanged.AddListener(toitem.SetInteractible);
+
+            Toggle toggle_expand = Find<Toggle>(nameof(toggle_expand));
+            toggle_expand.onValueChanged.AddListener(item.OnExpand);
+
+            button_selectitem = Find<Button>(nameof(button_selectitem));
+            button_selectitem.onClick.AddListener(OnClickItem);
+
+            toitem.IsDisplayable = !toggle_display.isOn;
+            toitem.IsInteractible = !toggle_interactible.isOn;
+        }
+
+        void OnClickItem()
+        {
+            onClick?.Invoke(this);
+        }
+        public void ActiveHighlight()
+        {
+            //var option = FindSingle<OptionManager>().hierarchyItemOption;
+
+            //button_selectitem.image.color = option.selectColor;
+        }
+        public void DeactvieHighlight()
+        {
+            //var option = FindSingle<OptionManager>().hierarchyItemOption;
+
+            //button_selectitem.image.color = option.unselectColor;
+        }
+
+        void DestroyItemView()
+        {
+            onDestroy?.Invoke(this);
+            Destroy(gameObject);
+        }
+    }
+}
diff --git a/Assets/legacy/Scripts/UI_HierarchyItem.cs.meta b/Assets/legacy/Scripts/UI_HierarchyItem.cs.meta
new file mode 100644
index 00000000..513674b0
--- /dev/null
+++ b/Assets/legacy/Scripts/UI_HierarchyItem.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: ac0660c9602721445bf58cd13e50cccd
\ No newline at end of file
diff --git a/Assets/legacy/testscene.unity b/Assets/legacy/testscene.unity
new file mode 100644
index 00000000..2e3e3306
--- /dev/null
+++ b/Assets/legacy/testscene.unity
@@ -0,0 +1,1417 @@
+%YAML 1.1
+%TAG !u! tag:unity3d.com,2011:
+--- !u!29 &1
+OcclusionCullingSettings:
+  m_ObjectHideFlags: 0
+  serializedVersion: 2
+  m_OcclusionBakeSettings:
+    smallestOccluder: 5
+    smallestHole: 0.25
+    backfaceThreshold: 100
+  m_SceneGUID: 00000000000000000000000000000000
+  m_OcclusionCullingData: {fileID: 0}
+--- !u!104 &2
+RenderSettings:
+  m_ObjectHideFlags: 0
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