This solution only works for vectors that are already sorted from low to high :) but it passed the test suite
Find the sum of the elements in the "second" diagonal
Return elements unique to either input
Fill a zeros matrix
Produce a cosine wave
First non-zero element in each column
Create a matrix X, where each column is a shifted copy of the vector v
A quadrant matrix
Find the elements of a matrix according to a defined property.
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