Compare two strings, whether they are equal or not.
Replace NaNs with the number that appears to its left in the row.
sum of non-primes
Sum of integers numbers
find the surface area of a cube
Find hen's weight.
Replace x value into y value in string text.
Set x value to each even index of vector y.
Find scalar product of two polynomials a and b, given as vector array.
Calculate the sum of elements of n*n Hilbert matrix.
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