Please! Can you explain more than that?
Aye! The first column is not "sorted according the second column" (only half an explanation). The block of numbers in each row is treated as a fixed unit, and each row is rearranged such that the values in the second column are sorted in ascending order.
Remove any row in which a NaN appears
Test if two numbers have the same digits
Who has power to do everything in this world?
Side of an equilateral triangle
function on a moving window
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