Note that the row and column order is the same as the element order in each set, and the index variable names are consistent between lines 12, 13, and 14.
注意行和列的次序与元素在每个集合中的顺序是相同的，索引变量名在第12、13和14行是一致的。
Note that the row and column order is the same as the element order in each set, and the index variable names are consistent between lines 12, 13, and 14.
注意行和列的次序与元素在每个集合中的顺序是相同的，索引变量名在第12、13和14行是一致的。
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