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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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The problem seems to be when any r, g or b value is between 10 and 16 it drops the preceeding '0' eg. 10(dec) -> A(hex) instead of 0A(hex). So a quick fix is to just add a case for when the value is between 10-16 and drop that 0.