END_ FOR语句在一个梯级逻辑中必须是唯一的。一个FOR_LOOP可以通过设置一个负的增加量给下标变量递减赋值。例如如果START的值21，END的值是1，增加值是-5，执行5次程序循环，下标变量每次减少5，下标变量的值依次是21，16,11,6和1.
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