May you add some testcases concerning that ~mod(63-45,9) = true, but 63 and 45 has definitely not the same digits.
Inner product of two vectors
Is the Point in a Circle?
Rotate a Matrix by 90 degrees
Symmetry of vector
Determine the square root
Number of Circles in a Number
Lychrel Number Test (Inspired by Project Euler Problem 55)
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