Rob recommends using the following three steps to answer the question ( which works for any sort of brain teaser question).
罗布推荐用一下三步回答(也适合其他的脑筋急转弯问题)
Black Mirror Season 4 Episode Titles, Cast, Teaser Revealed
《黑镜》第四季预告片曝光,6集标题抢先看
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