May you add some testcases concerning that ~mod(63-45,9) = true, but 63 and 45 has definitely not the same digits.
Tell me the slope
Omit columns averages from a matrix
Who invented zero?
Switch matrix to a column vector
Area of a triangle
Read a Soroban Abacus
Parse me a Lisp
Recurring Cycle Length (Inspired by Project Euler Problem 26)
Roll the Dice!
Set a Soroban Abacus
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