For roughly the first decade of the "cash machine," they were offline devices
Message patterns can also be configured with arbitrary conditions:
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Steven Frank, the co-founder of Panic, wrote this in 1999, with similar themes:
方向遍历顺序说明下一个倒序（从右往左）先处理右侧，栈里存「右侧候选」上一个正序（从左往右）先处理左侧，栈里存「左侧候选」