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- lastrev rs b = maximum [r | r <- rs, length r >= l && take l r == b] where l = length b
- --*Main> lastrev ["1.1", "1.2", "1.3", "1.3.2.1", "1.3.2.3", "1.3.2.4", "1.3.4.1", "1.4", "1.5"] "1.3.2"
- --"1.3.2.4"
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