C111123313331323113313331333133313331323131211113313231323311311   >>    C11112331333132311331333133313331333132313121111331323132331131   <<    C111123313331323113313331333133313331323131211113313231323311313   >>      C111123313331323113313331333133313331323131211113313231323311312   >>