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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.
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Since routine does not include the break statement in each case, all the examples are in case 'd', so it would not be a valid solution.
This solution does not satisfy the exercise :
int numbers[] = {678, 10, 1001, 1000};
It seems that at the end of the second string there is a space of more after the last u.