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"
does it touch ?
Is A the inverse of B?
Detect a number and replace with two NaN's
Right and wrong
So many choices
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