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.
Test for balanced parentheses
Remove the small words from a list of words.
give nth decimal place of pi
Angle between two vectors
02 - Vector Variables 3
Read a Soroban Abacus
Return the first and last character of a string
Set a Soroban Abacus
The Dark Side of the Die
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