,5L>G$ ,P>5!SES ,EXAMPLES #A4 ,TWO BY TWO MATRIX F/ R[ "O Z]O SECOND R[ Z]O "O IS WRITT5 _% ,(#1 #0,) ,(#0 #1,) _: #B4 ,TWO BY ?REE MATRIX F/ R[ A ;B ;C SECOND R[ ;D ;E ;F IS WRITT5 _% ,(A B C,) ,(D E F,) _: #A