Check whether the input matrix is a figurate number triangle: http://mathworld.wolfram.com/FigurateNumberTriangle.html
you should probably add a test case where the correct answer is false.
I added a few more tests as suggested.
Remove all the words that end with "ain"
Reverse the vector
Scoring for oriented dominoes
intersection of matrices
Add two numbers
Is my wife right?
Are you in or are you out?
Right and wrong
Is my wife right? Now with even more wrong husband
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