a c a x1 c a c x1 a a b x1 a d b x1 a b x1 b a a x1 d d x1 a d b x1 b b x1 b c x1 a d c x1 c a x1 b c x1 a a a x1 a 1 c 1 b 1 d 1 FULL ./SRS/Zantema/z082.srs