C111123313331323113313331333133313331323133112113313232233312121   >>    C11112331333132311331333133313331333132313311211331323223331212   <<    C111123313331323113313331333133313331323133112113313232233312123   >>      C111123313331323113313331333133313331323133112113313232233312122   >>