For either the Main Level or the extra Level. Paste in only the LURD solution, no extra text. Submit only one solution at a time.
请仅粘贴lurd格式答案，不要含有其他多余信息。一次只能提交一个答案。
For either the Main Level or the extra Level. Paste in only the LURD solution, no extra text. Submit only one solution at a time.
请仅粘贴lurd格式答案，不要含有其他多余信息。一次只能提交一个答案。
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