I didn't spot this by myself. A reader first tipped me off to the similarities between the U24 …
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通过网上的资料，流程见下图 ：
Think about how you'd search a large room for a lost key. You wouldn't examine every square inch sequentially. You'd split the room into sections (by the couch, near the door, under the table) and rule out entire sections at a glance. "I didn't go near the kitchen, so skip that."，推荐阅读夫子获取更多信息