Replace NaNs with the number that appears to its left in the row.
Test for balanced parentheses
Get the area codes from a list of phone numbers
middleAsColumn: Return all but first and last element as a column vector
Check if number exists in vector
Back to basics 14 - Keywords
Convert Roman to Arabic Numerals
Back to basics 25 - Valid variable names
Back to basics 15 - classes
Back to basics 8 - Matrix Diagonals
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