Created
December 8, 2013 21:49
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| datatype nat = z | s of nat | |
| fun fold _ zv z = zv | |
| | fold sf zv (s n) = sf (fold sf zv n) | |
| fun pz _ = z | |
| fun ps g h = h (g s) | |
| fun id x = x | |
| fun p n = (fold ps pz n) id |
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