For given input matrix a, rotate it by 90 degrees and find the sum of the diagonals.
1 2 3 4
5 6 7 8
8 10 12 -2
-1 -3 -5 -7
Remove all the words that end with "ain"
Get the length of a given vector
Flip the bit
multiple of nine?
Find NaNs in the matrix
Basic Quadratic Equation
Perimeter of a semicircle
count upper and lower case characters
Repetition of matrices
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