Convert a date string to a serial date number.
For example if you take
then the result is 730990
then the result is 736858
Which doors are open?
Get the area codes from a list of phone numbers
Project Euler: Problem 6, Natural numbers, squares and sums.
Given a 4x4 matrix, swap the two middle columns
MATCH THE STRINGS (2 CHAR) very easy
kmph to mps
CONVERT TAN TO SIN
Given area find sides
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