Given an array, return the cumulative difference.
a = [ 1 3 5 7 ]
cumdiff = [ 1 2 1 -2 ]
Remove all the consonants
radius of a spherical planet
Remove NaN ?
Duplicate a character
Sum of diagonals elements of a matrix
Find offset of an element of a multi dimensional matrix
Let's get back to school, and create multiplication tables
Broken numlock key, oppps !
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