Determine if it's satisfiable or not WITHOUT USING ANY EXTERNAL TOOLS.
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1990年代至2000年代中期，相關指標曾一路上行。，推荐阅读谷歌浏览器【最新下载地址】获取更多信息
Mr Duffy's comments about the potential for China and Russia to potentially "declare a keep-out zone" on the Moon appear to be referring to an agreement called the Artemis accords.