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.
Most nonzero elements in row
Right and wrong
Project Euler: Problem 1, Multiples of 3 and 5
Back to basics 12 - Input Arguments
Remove from a 2-D matrix all the rows that contain at least one element less than or equal to 4
Cache me Outside
Great Circle Distance
Read a Soroban Abacus
Clock Hand Angle 1
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