The title and description of this problem have been cleaned up. Also, its test suite has been expanded and improved.
Back to basics 7 - Equal NaNs
Back to basics - mean of corner elements of a matrix
Vectors counting by 2
Divide by 4
Check if a matrix is a palindrome in all directions
Opposite task convert binary numbers array into array of decimal numbers.
Select primes from the matrix.
Compare two strings.
Solve expression II
Count given word x in text.
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