Task: Discourse Relation Classification
Input (English): Sentence 1:Ambulocetus was the size of a male sea lion , much larger than Pakicetus . Sentence 2:Thewissen et al. estimated the body weight of Ambulocetus at 141 -- 235 kg ( 311 -- 518 lb ) , while Philip D. Gingerich estimated it at 720 kg ( 1,590 lb ) .
Output (English): PAIR_ANAPHORA