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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.
For those who are unsure what multiplicity means in this context:
A multiplicity is the number of times an element appears in a set (more specifically, a multiset, i.e. a set that can have repeated elements).
e.g. In the set {1, 2, 2, 3, 4, 5}, the number 2 appears twice, hence, it has a multiplicity of 2, whereas the numbers 1, 3, 4 and 5 have multiplicites of 1.