a a a a x1 b b x1 b b a a x1 a a b b x1 b b b b c c x1 c c a a x1 b b b b x1 a a a a a a x1 c c a a x1 b b a a c c x1 a 1 b 1 c 1 FULL ./SRS/Trafo/dup17.srs