--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/final_pre/src/AgdaTree.Agda	Mon Feb 19 23:32:24 2018 +0900
@@ -0,0 +1,17 @@
+record TreeMethods {n m : Level } {a : Set n } {t : Set m } (treeImpl : Set n ) : Set (m Level.⊔ n) where
+  field
+    putImpl : treeImpl -> a -> (treeImpl -> t) -> t
+    getImpl  : treeImpl -> (treeImpl -> Maybe a -> t) -> t
+open TreeMethods
+
+record Tree  {n m : Level } {a : Set n } {t : Set m } (treeImpl : Set n ) : Set (m Level.⊔ n) where
+  field
+    tree : treeImpl
+    treeMethods : TreeMethods {n} {m} {a} {t} treeImpl
+    putTree : a -> (Tree treeImpl -> t) -> t
+    putTree d next = putImpl (treeMethods ) tree d (\t1 -> next (record {tree = t1 ; treeMethods = treeMethods} ))
+    getTree : (Tree treeImpl -> Maybe a -> t) -> t
+    getTree next = getImpl (treeMethods ) tree (\t1 d -> next (record {tree = t1 ; treeMethods = treeMethods} ) d )
+
+open Tree
+