Given the matrix M, return M without the external frame.
Additional test cases have been added.
Summing Digits within Text
Back to basics 11 - Max Integer
Close MATLAB with keyboard
Matlab Basics - y as a function of x
Matlab Basics II - Count rows in a matrix
subtract central cross
Fermat's Last Theorem - Fermat's conjecture
Find the function
Given a matrix, return the last eigen value
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