n2 js 1 n1 n2 1 n1 n1 1 j av-j 1 js n1 1 js n2 1 np-n1 jc 1 n1 j 1 np1 crd 1 j n2 1 crd n1 1 ng1 n1 1 j j 1 av-j n2 1 n2 j 1 j n1 1 n2 ng1 1 n2 np-n1 1 n1 js 1