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diff wisdom/lens @ 5138:1eb6c53a03d4

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<shachaf> revert 5134
author HackBot
date Sun, 16 Nov 2014 19:44:12 +0000
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/wisdom/lens	Sun Nov 16 19:44:12 2014 +0000
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+A lens is just a store comonad coalgebra.