tb2n1 ub2n12 vb2n wb2n1 xb2n12

i22n12 j22n k22n1 l22n12 m22n

7s3n 8s3n1 9s3n12 at3n bt3n1

wj4n1 xj4n12 yj4n zj4n1 0j4n12

la5n12 ma5n na5n1 oa5n12 pa5n