In this task, you are given two sentences in the English language and your task is to classify them into one of their discourse types. A discourse type is an indicator to classify the given two sentences on the basis of a co-text as well as a relevant context. There are 13 discourse types in total which are 'SINGLE_S_COORD', 'SINGLE_CATAPHORA', 'SINGLE_CONN_INNER', 'SINGLE_APPOSITION', 'SINGLE_VP_COORD', 'SINGLE_CONN_START', 'PAIR_ANAPHORA', 'PAIR_CONN', 'SINGLE_RELATIVE', 'SINGLE_CONN_INNER_ANAPHORA', 'SINGLE_S_COORD_ANAPHORA', 'PAIR_CONN_ANAPHORA' and 'PAIR_NONE'.

Input: Consider Input: 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: PAIR_ANAPHORA


Input: Consider Input: Sentence 1:Newt , now distanced from Call , becomes uneasy with Dunnigan because of his campaign to drive the other ranchers of the region out of business , but is reluctant to part ways because of the debt he feels he owes him . Sentence 2:nan

Output: SINGLE_S_COORD_ANAPHORA


Input: Consider Input: Sentence 1:Running his Sharadha Kala Niketanaya , he endeavoured to teach , develop and popularise Indian classical music in Sri Lanka for the last forty years . Sentence 2:nan


Output: SINGLE_CATAPHORA