av-j n1 2 n1 n2 4 n1 n1 6 n2 n1 4 n2 av-j 1 np1 crd 1 n1 av-j 3 crd ng1 1 ng1 n1 1 av-j n2 2 n2 n2 1 n2 j 1 j n1 3 n1 j 2