Replace NaNs with the number that appears to its left in the row.
Sorted highest to lowest?
Create a vector whose elements depend on the previous element
Replace multiples of 5 with NaN
Find the index of the largest value in any vector X=[4,3,4,5,9,12,0,4.....5]
Find state names that end with the letter A
Return the 3n+1 sequence for n
Finding Perfect Squares
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