C11111211113313112113313331333133313133313232233131333131322121   >>    C1111121111331311211331333133313331313331323223313133313132212   <<    C11111211113313112113313331333133313133313232233131333131322123   >>      C11111211113313112113313331333133313133313232233131333131322122   >>