Convert the input sentence to upper case and replace all vowels with an underscore ('_')
Sort a list of complex numbers based on far they are from the origin.
Which doors are open?
Replace NaNs with the number that appears to its left in the row.
Element by element multiplication of two vectors
Calculate some equation
Basics: counting digits of a number irrespective of the sign
Check if there are white spaces in the input string
Product of all elements in an array
Sum of unique multiples of 3 and 5
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