a d x1 d b x1 a x1 b b b x1 d x1 x1 a x1 x1 b d b x1 a d x1 b c x1 c d d x1 a c x1 b b c d x1 a 1 d 1 b 1 c 1 FULL ./SRS/Zantema06/10.srs