There are to be no blank lines in the output.
每行输出没有多余的空格，且只输出一个数据。
Make sure that there are no blank lines before or after the tag.
确定标签的前后没有空白的行。
There should be no blank lines printed between each pair of output lines.
输出两行结果之间不要有空行。
There should be no blank lines printed between each pair of output lines.
输出两行结果之间不要有空行。
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