王子建出守於城父，與成公乾遇於疇中。
Once, when Prince Jian148 was out hunting in Chengfu, he met Chenggong Gan150 in a cleared field.
問曰：「是何也？
“What is this?” he asked.
」成公乾曰：「疇也。」
“It is a cleared field” was the reply.