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'.

Example Input: Sentence 1:Hearing about the Untold Legend series , Byrne contacted editor Paul Levitz to express interest . Sentence 2:nan
Example Output: SINGLE_CATAPHORA

Example 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
Example Output: SINGLE_S_COORD_ANAPHORA

Example Input: Sentence 1:At the conclusion of the survey , researchers found that out of 2552 ex-NFL players , 9.1 % self reported using anabolic steroids during their career . Sentence 2:Furthermore , 16.3 % of Offensive lineman and 14.8 % of defensive lineman surveyed reported using steroids during their careers .
Example Output:
PAIR_CONN_ANAPHORA