Given a number, return the number of closed 'circles' in the base 10 numerical representation.
Note: the number 4 has no circles
8819 -> 5
Interpolating on a string (the ASCII values) is an interesting idea even though the long interpolation string could be reduced by subtracting '0', but at the expense of a "longer" solution.
Sum the entries of each column of a matrix which satisfy a logical condition.
Test if two numbers have the same digits
07 - Common functions and indexing 5
ASCII Birthday Cake
Parse me a Lisp
Set a Soroban Abacus
Next Lower Power of B
Recurring Cycle Length (Inspired by Project Euler Problem 26)
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