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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.
This solution has an almost wasteless approach to combinaotircs. And it is also fast. Well done!
No it's not.
Fixed
PHP 7.0 and 7.4 tests crash :( "TEST" button works but "ATTEMPT" returns an error in codewars code. Submitted a bug report.
Perl's motto: "There's more than one way to do it"!
Gosh! There was a simple formula ) now my truly computating solution looks stupid among the others)