C11111211113313112113313331333133313133313232233133313113313112121332121   >>    C1111121111331311211331333133313331313331323223313331311331311212133212   <<    C11111211113313112113313331333133313133313232233133313113313112121332123   >>      C11111211113313112113313331333133313133313232233133313113313112121332122   >>