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有位客人到某人家里做客，看见主人家的灶上烟囱是直的，旁边又有很多木材。
客人告诉主人说，烟囱要改曲，木材须移去，否则将来可能会有火灾，主人听了没有
作任何表示。
不久主人家里果然失火，四周的邻居赶紧跑来救火，最后火被扑灭了，于是主人
烹羊宰牛，宴请四邻，以酬谢他们救火的功劳，但并没有请当初建议他将木材移走，
烟囱改曲的人。
有人对主人说：“如果当初听了那位先生的话，今天也不用准备筵席，而且没有
火灾的损失，现在论功行赏，原先给你建议的人没有被感恩，而救火的人却是座上客，
真是很奇怪的事呢！主人顿时省悟，赶紧去邀请当初给予建议的那个客人来吃酒。
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