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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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It's matter of definition, and this kata defines
fib 0
as0
. As long as it's defined unambiguously, it's not a problem.To me,
fib 0 = 0
makes more sense thanfib 0 = 1
, because negative inputs work better ( more symmetrically ).