@Cris Luengo, filter2 is not a toolbox function, (I am not aware if it was earlier or not) and should be allowed now.
Strictly incomprehensible for me.
Well done :!
Really nifty!! ;-)
Hackathon: the beginnings
Find best placement for ordered dominoes (harder)
Rotate input square matrix 90 degrees CCW without rot90
Sum the Digits of a Number
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