Created
November 15, 2019 18:18
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| foldb1 op = foldb' where | |
| pairwise (x:y:rest) = op x y : pairwise rest | |
| pairwise shortList = shortList | |
| foldb' xs@(_:_:_) = foldb' (pairwise xs) | |
| foldb' [x] = x | |
| foldb op def xs = foldb1 op (def:xs) |
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