C11111211113313112113313331333133313231311331333133112213221211   >>    C1111121111331311211331333133313331323131133133313311221322121   <<    C11111211113313112113313331333133313231311331333133112213221213   >>      C11111211113313112113313331333133313231311331333133112213221212   >>