Task: Discourse Relation Classification
Input (English): Sentence 1:Leaching powdered 96 -- 97 % pure silicon with water results in ~ 98.5 % pure silicon , which is used in the chemical industry . Sentence 2:However , even greater purity is needed for semiconductor applications , and this is produced from the reduction of tetrachlorosilane or trichlorosilane .
Output (English): PAIR_CONN