<prompt> Translate the following text to EnglishKwa hiyo Dorcas hajui chochote kuhusu ndevu hiyo nyeusi, alisema Poirot kwa kufikiri, wakati sisi walikwenda nje katika ukumbi tena.  <response>: So Dorcas knows nothing about that black beard, said Poirot thoughtfully, as we walked out into the hall again. 