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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
haskell test is wrong
this is the correction, you have a .&&. in place of .||. and that can work only for xs == ys
it "works if s is simply the concatenation of both parts" $
property $ \xs ys ->
isMerge (xs ++ ys) xs ys .||. isMerge (ys ++ xs) xs ys