两个小阴线夹着一根大阳线

Ning Cheng had a total of eighteen nine-color mirages, and gave one to Liang Kexin. He also had seventeen nine-color mirages. Now seventeen jade boxes were opened by him one by one. When Ning Cheng discovered that among the seventeen jade boxes, there were only eight nine-color mirage stones, and the remaining jade boxes were empty, he was stunned....