Given the matrix M, return M without the external frame.
Additional test cases have been added.
surface of a spherical planet
Back to basics 13 - Input variables
Determine if input is a perfect number
Add a row of zeros on top of a matrix
Is this triangle right-angled?
Find the function
Given a matrix, return the last eigen value
Distance of the centroids of the balls
Inverse of Hilbert matrix
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