The former sometimes discusses the order, the key is to see if there are some suggestive words in the topic, such as simultaneous, sequential, etc., so the key is to understand the topic. Except for the latter, a triangle consists of three sides. If the extraction order of three sides is changed, will the same triangle be formed? The answer is obviously no, so the latter does not need to look at the order. When doing this kind of extracted topic, it is mainly to look at the topic and be cautious.

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