n1 n2 1 n1 j-jn 1 n1 n1 1 np1 np1 1 np1 crd 1 npg1 n1 1 crd n1 1 n1 npg1 1 j np1 1 j-jn n1 1 n2 j 1 j n1 1 np1 j 1 n1 j 1 n1 jp 1