n1 n2 2 n1 np1 2 n1 n1 3 n2 j 1 n1 ng1 1 np1 crd 3 j n2 3 jc jc 1 ng1 n2 1 j crd 1 crd n1 4 n1 jc 2 jc crd 1 n2 n1 5 j n1 3 n2 ng1 1 ng1 j 1 jc n2 1 n1 j 5 crd n2 1