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接下来是文章内容，我得先介绍降级保级的背景，说明意甲联赛每年都有球队降级，这对保级球队来说是个挑战，然后详细解释降级保级的规则，包括积分、胜负关系、胜负场次、胜负净胜球、胜负进球数、胜负客场进球数、胜负主场进球数、胜负客场净胜球、胜负净胜球差、胜负进球差、胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负胜负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