Starting with the identity matrix, change first and last diagonal element to zero.

Example

If n=5

 A =
     0     0     0     0     0
     0     1     0     0     0
     0     0     1     0     0
     0     0     0     1     0
     0     0     0     0     0
Solve

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Last Solution submitted on Feb 17, 2026

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Matthew Bolyard Roberto Alexandra Lorenzo

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