The problem description and test suite have been improved.
Make a checkerboard matrix
Swap the first and last columns
Replace May with April
Multiply a column by a row
Find the sines of an isosceles triangle when given its area and height
Sum positive elements of matrix.
Find scalar product of two polynomials a and b, given as vector array.
Compare two strings.
Multiply two polynomials p and q given in in vector representation.
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