mat( ( 1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0),
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     ( 0,0,0,0,0,0,0,0,2,0,0,0,0,0,0,0,0,0,0,0),
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     ( 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 ) )