IF IF = THEN THEN THEN = ELSE ELSE ELSE = IF;
剑栈风樯各苦辛，别时冰雪到时春
以下是引用林月儿在2015-11-9 14:56:00的发言：
IF IF = THEN THEN THEN = ELSE ELSE ELSE = IF;
可简化：2IF = 3THEN = 3ELSE = 1IF;
IF IF = THEN THEN THEN = ELSE ELSE ELSE = IF;
