then the += will modify the list, and then raise an exception because you can’t assign to that tuple item because the tuple is immutable, but the list will have been mutated.
Reject the write — refuse to accept more data
。关于这个话题，WPS下载最新地址提供了深入分析
Number (8): Everything in this space must add up to 8. The answer is 3-4, placed horizontally; 4-6, placed horizontally.，更多细节参见WPS下载最新地址
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