C11111211113313112113313331333133313231311331333132222132212111   >>    C1111121111331311211331333133313331323131133133313222213221211   <<    C11111211113313112113313331333133313231311331333132222132212113   >>      C11111211113313112113313331333133313231311331333132222132212112   >>