write a function that gives the indexes of rising or falling edge
x is a vector (assume it contains always at least one element)
str is a string with value 'up' or 'down', describing if you must return indexes of rising or falling edges
Tic Tac Toe FTW
Wrapping the Tower of Pisa
Find Index of maximum Value and maximum Value of a vector
Given a 4x4 matrix, swap the two middle columns
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