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Numbers with prime factors 2, 3 and 5.
Return the first and last characters of a character array
Change the sign of even index entries of the reversed vector
Remove element(s) from cell array
Find x rows where the sum of the numbers is the maximum
Draw a '5' in a zero matrix!
Draw a '7' in a zero matrix!
Draw a '8' in a zero matrix!
Draw a '4' in a zero matrix!
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