var lists = [ [3,4,34,25,9,12,36,56,36], [2,8,81,169,34,55,76,49,7], [75,121,75,144,35,16,46,35], ] say lists.flat.grep{.is_square}.sort
[4, 9, 16, 25, 36, 36, 49, 81, 121, 144, 169]
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