<prompt> tafadhali geuza maudhui haya ya swahili kwenda kwa lugha.kwanza, kuna majaribio kwamba kuhusisha kuuza au kununua kitu mfano, doleac and stein 2013.  <response>: okokuqala, kukhona ucwaningo nalokho ezihilela ukuthengisa noma ukuthenga okuthile isib, doleac and stein 2013. 