Created
January 29, 2014 10:21
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| datatype 'label btree = | |
| Empty | | |
| Node of 'label * 'label btree * 'label btree; | |
| fun sumBinTree(Empty) = 0 | |
| | sumBinTree(Node(a, left, right)) = | |
| a + sumBinTree(left) + sumBinTree(right); |
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