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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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Thanks! It was interesting to solve it. Hard kata. I had to remember gauss method that I learn many years ago in univercity.
One issue there: I guess that in 1 and 5 tests are double space between numbers. I pass this tests only when I use rows[ir]=rows[ir].Replace(" "," "); in my code.
Of course correct regex is also decision, but may be it is better to fix tests.