See Problem 42411 by Grant III
@Jean-Marie Sainthillier: You are right, sorry for not have checked before.
And thank you for the info, the problem-series by Grant III is very useful.
Times 2 - START HERE
Return a list sorted by number of occurrences
How to find the position of an element in a vector without using the find function
Back to basics 23 - Triangular matrix
Return 'on' or 'off'
Number of occurrences of letter in a text
prime to each other
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