a a a a x1 b b b b b b x1 b b b b x1 c c c c c c x1 c c c c x1 d d d d d d x1 b b x1 d d d d x1 c c d d d d x1 a a x1 a 1 b 1 c 1 d 1 FULL ./SRS/Trafo/dup16.srs