Remove the air bubbles
Generate a random matrix A of (1,-1)
Basic arrays operations.
Draw a 'Z'.
Get the elements of diagonal and antidiagonal for any m-by-n matrix (★★★★)
Make a checkerboard matrix (★★★★★)
Doubling elements in a vector (★★)
Approximate functions 1 (★★★)
Sum of elements in a vector (★)
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