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<pre>/* default lang */ printf("hello! world\n");</pre>
<pre lang='zh'>/* zh */ printf("hello! world\n");</pre>
<pre lang='zh-tw'>/* zh-tw */ printf("hello! world\n");</pre>
<pre lang='zh-cn'>/* zh-cn */ printf("hello! world\n");</pre>
<pre lang='ja'>/* ja */ printf("hello! world\n");</pre>