C111123313331323113313331333133313331323132311233133313231312121   >>    C11112331333132311331333133313331333132313231123313331323131212   <<    C111123313331323113313331333133313331323132311233133313231312123   >>      C111123313331323113313331333133313331323132311233133313231312122   >>