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
Omit columns averages from a matrix
Project Euler: Problem 10, Sum of Primes
07 - Common functions and indexing 4
Fibonacci-Sum of Squares
Volume of a box
count upper and lower case characters
Check for keywords
Return median of a matrix
Check if there are white spaces in the input string
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