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zfnmxt/gist:86e90b4b310703f72158d164d33bf0c4 Secret

Created September 8, 2021 14:50
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gistfile1.txt
proof (prove)
goal (1 subgoal):
1. rev (if P x
then dropWhile P (rev xs)
else x # rev xs) =
(if P x
then rev (dropWhile P (rev xs))
else xs @ [x])
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