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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.
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that is correct
Becase it has ONLY two different digits - not more, not less. 111 - not doubleton(has only 1 digit), 123 - not doubleton(has 3 different digits), 112 - doubleton(has 2 different digits - 1 and 2). That's why 10 and 12 are doubletones but 11 is not.
"you need to find the next doubleton number"
Maybe you're mixing up the inputs of different tests. Does that
xbelong to a different test?