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Implement a ROT13 cipher
surface of a spherical planet
What is the distance from point P(x,y) to the line Ax + By + C = 0?
Count up then down
Flip the vector from right to left
It dseon't mettar waht oedrr the lrettes in a wrod are.
Summing Digits within Text
Swap the first and last columns
Find the numeric mean of the prime numbers in a matrix.
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