s='A fractal is a natural phenomenon or a mathematical set that exhibits a repeating pattern that displays at every scale'
result = 12
Return a list sorted by number of occurrences
Implement a ROT13 cipher
Find the nearest integer
Find the sum of the negative elements under the main diagonal.
Calculate the centroid of a triangle
Return the amount of palindromes (words) in the string.
Check if a string starts with another string
Return ! if array element starts with a certain letter. Otherwise return ?
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