improve test suit
Back to basics 5 - Clipboard
How many trades represent all the profit?
Sum of the Matrix Elements
Deleting an element in a matrix
Beginner's Problem - Squaring
Remove from a 2-D matrix all the rows that contain at least one element less than or equal to 4
First non-zero element in each column
vectorization in N
Create a matrix X, where each column is a shifted copy of the vector v
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