C31231211111133131211113313331333132233133313331313223313221321   >>    C3123121111113313121111331333133313223313331333131322331322132   <<    C31231211111133131211113313331333132233133313331313223313221323   >>      C31231211111133131211113313331333132233133313331313223313221322   >>