The third element in the test-suite does not match the image in the problem description.
Replace May with April
Return the first and last characters of a character array
subtract central cross
Switch matrix to a column vector
Sum of first n positive integers
06 - Matrix Equations 2
05 - Vector Equations 1
04 - Scalar Equations 3
05 - Vector Equations 3
06 - Matrix Equations 1
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