Given a list of ISBN's, check whether they're valid or not.
Prev Prob - https://www.mathworks.com/matlabcentral/cody/problems/45486
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Let's get back to school, and create multiplication tables
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I saw you optimize it again, Binbin have to work harder...
cospi is some move indeed.Inspired by that, I used it in generating a checkboard matrix(cody problem 4).