A 1 1=ak+bn+cq,A 12=al+bo+cr,a 13 = am+BP+cs;
A2 1=dk+en+fq,A22=dl+eo+fr,A23 = DM+EP+fs;
A3 1=hk+in+jq,A32=hl+io+jr,A33 = hm+IP+js;