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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.
"The given string is a 2D plane of random length consisting of two characters" is incorrect;
"2D plane" to descibe a 1D string,
"random length consisting of two characters" to describe non-fixed length of chars from a set of two chars.