May you add some testcases concerning that ~mod(63-45,9) = true, but 63 and 45 has definitely not the same digits.
Which doors are open?
radius of a spherical planet
Return unique values without sorting
Make an N-dimensional Multiplication Table
Great Circle Distance
The Dark Side of the Die
Read a Soroban Abacus
Project Euler: Problem 16, Sums of Digits of Powers of Two
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