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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 exercise is OK, but the instructions definitely needs improvements. Solving this kata requires some guesswork.
I get the following:
Test Failed: Gave title="ab", minorWords="ab". Expected "Ab" but got "ab".
which indicates that an incorrect expected value is used in the test. My function returns 'ab' but fails this test.
The instructions specify that the input matrix should be square, but the test cases tests against non-square matrices. Also the test cases can be affected by changing the input matrix.