Return a list sorted by number of occurrences
Implement a ROT13 cipher
Project Euler: Problem 5, Smallest multiple
Find out missing number from a vector of 9 elements
Switch matrix to a column vector
Right Triangle Side Lengths (Inspired by Project Euler Problem 39)
Return the first and last character of a string
Set a Soroban Abacus
Recurring Cycle Length (Inspired by Project Euler Problem 26)
Determine if a Given Number is a Triangle Number
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