C11111211113313112113313331333133313231311331333133311221123232321323321   >>    C1111121111331311211331333133313331323131133133313331122112323232132332   <<    C11111211113313112113313331333133313231311331333133311221123232321323323   >>      C11111211113313112113313331333133313231311331333133311221123232321323322   >>