Find the numeric mean of the prime numbers in a matrix.
Return the first and last character of a string
Is it a number?
Tick. Tock. Tick. Tock. Tick. Tock. Tick. Tock. Tick. Tock.
Times 2 - START HERE
Back and Forth Rows
Reverse Run-Length Encoder
Tic Tac Toe FTW
Get the area codes from a list of phone numbers
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