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diff --git a/files/practicum/BinTreeMapEnFold.icl b/files/practicum/BinTreeMapEnFold.icl
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+++ b/files/practicum/BinTreeMapEnFold.icl
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+module BinTreeMapEnFold
+
+import StdEnv
+
+:: BTree a				= Tip a | Bin (BTree a) (BTree a)
+
+testboom				= Bin (Bin (Bin (Tip 1) (Tip 2)) (Tip 3)) (Bin (Bin (Tip 4) (Tip 5)) (Bin (Tip 6) (Bin (Tip 7) (Tip 8))))
+
+mapbtree				:: (a -> b) (BTree a) -> BTree b
+mapbtree f (Tip a)		= Tip (f a)
+mapbtree f (Bin t1 t2)	= Bin (mapbtree f t1) (mapbtree f t2)
+
+foldbtree				:: (a a -> a) (BTree a) -> a
+foldbtree f (Tip a)		= a
+foldbtree f (Bin t1 t2)	= f (foldbtree f t1) (foldbtree f t2)
+
+f1						:: // meest algemene type
+f1						= foldbtree (+)
+
+f2						:: // meest algemene type
+f2						= foldbtree (+) o (mapbtree (const 1))
+
+f3						:: // meest algemene type
+f3						= foldbtree (\x y -> 1 + max x y) o (mapbtree (const 0))
+
+f4						:: // meest algemene type
+f4						= foldbtree (++) o (mapbtree (\x -> [x]))
+
+Start :: (Int,Char,Int,Char,Int,Char,[Int],Char)
+Start = (f1 testboom, '\n'
+        ,f2 testboom, '\n'
+        ,f3 testboom, '\n'
+        ,f4 testboom, '\n'
+        )