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Niklas Hambüchen suggested that we add the dual of `subsequences`, isSubsequenceOf (like `isPrefixOf` to `inits` & `isSuffixOf` to `tails`). It was a simple and noncontroversial proposal which passed unanimously. For more details see the original proposal discussion at https://www.haskell.org/pipermail/libraries/2014-November/024063.html Differential Revision: https://phabricator.haskell.org/D435 Signed-off-by: Alexander Berntsen <alexander@plaimi.net>
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