C111123313331323113313331333133313331323131211113313233311233233121   >>    C11112331333132311331333133313331333132313121111331323331123323312   <<    C111123313331323113313331333133313331323131211113313233311233233123   >>      C111123313331323113313331333133313331323131211113313233311233233122   >>