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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.
sorry for the maybe stupid question, but why reverse the item when using Deque as Stack ?
from the Deque doc: "When a deque is used as a stack, elements are pushed and popped from the beginning of the deque"
why not use addFirst() and removeFirst() then ?