Maby this one needs some more test suites ;)
improve test suit
Maybe more test cases here? ;-)
Sum all integers from 1 to 2^n
Implement simple rotation cypher
Return 'on' or 'off'
Perimeter of a semicircle
Convert a number to its Roman representation
Find the square of the sum of the digits of a number
Reverse a matrix
Concatenate two strings
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