C11111211113313112113313331333133313231311331333113313232213221   >>    C1111121111331311211331333133313331323131133133311331323221322   <<    C11111211113313112113313331333133313231311331333113313232213223   >>      C11111211113313112113313331333133313231311331333113313232213222   >>