May you add some testcases concerning that ~mod(63-45,9) = true, but 63 and 45 has definitely not the same digits.
Replace May with April
Getting the indices from a vector
Rotate a Matrix by 90 degrees
Rounding off numbers to n decimals
Solve the Sudoku Row
Read a Soroban Abacus
Lychrel Number Test (Inspired by Project Euler Problem 55)
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