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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.
In English, it means exactly what it says. One. Not any other number.
Well, mathematically speaking, "having one solution" means "having at least one solution", i.e. being solvable. So are the solutions always unique, is that what the kata wants to say?
I suspected as much. :P
No worries!
Please post examples for that. Any two different solutions for any puzzle will do. I rather suspect you're doing something wrong, but I'm very willing to be proven incorrect.