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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.
yeah, leaving Y out of the description was as annoying as the inverted expected v but was...
The description should be updated for clarity. I'm assuming that when you say '...and cannot transform into "WUBWUBIAMWUBX"' and 'at least one between any pair of neighbouring words' you actually mean at least one between EVERY pair of neighbouring words.