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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.
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I solve this years ago, and I use python2 at that time.
here as A we recieve function (b=>....)
later we call that function a(1) and it recieves as b "1" (1=>...)
also we call this function a(2) and it recieves as b "2" (2=>....)
we get first item of arrays of both functions and doing Math
Hope it helps )