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Is there a easy way to call on the minor of a matrix?

Given an nxn matrix, I want to call on the n/3Xn/3 (assume n divisible by 3) matrix appearing in the center so that I can change its elements to zeros. For example, if I had a 6x6 matrix A, I would want to change the entries A(15), A(16), A(21), A(22) to zeros.
1 Solution
How about this:

A is your matrix.

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