May you add some testcases concerning that ~mod(63-45,9) = true, but 63 and 45 has definitely not the same digits.
Energy of a photon
Calculate the area of a triangle between three points
Multiply 2 numbers
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Side of an equilateral triangle
Lychrel Number Test (Inspired by Project Euler Problem 55)
The Dark Side of the Die
Make an N-dimensional Multiplication Table
Clock Hand Angle 1
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