Loading collection data...
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.
Not a suggestion. Language not stated.
You aren't checking for "same multiplicity" there.
Done
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Acording to experience, I would leave it there as some code I encounter are not optimally written and leave it to programmer to solve it in such a way that doesnt break the SOLID principle.
But thats only a suggestion.