C31231211111133131211113313331333133313332233132321123232212121   >>    C3123121111113313121111331333133313331333223313232112323221212   <<    C31231211111133131211113313331333133313332233132321123232212123   >>      C31231211111133131211113313331333133313332233132321123232212122   >>