Axis: following
ElementNode-set
AAA id = a1a2 b3 b4 c1 c2 b5 c3
BBB id = b1b2 a2 b3 b4 c1 c2 b5 c3
BBB id = b2a2 b3 b4 c1 c2 b5 c3
AAA id = a2
BBB id = b3b4 c1 c2 b5 c3
BBB id = b4c1 c2 b5 c3
CCC id = c1b5 c3
CCC id = c2b5 c3
BBB id = b5
CCC id = c3