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:In this article , he explains that although the Book of Mormon Index page used to say that the River Sidon flowed North . Sentence 2:nan
Example Output: SINGLE_CONN_INNER

Example Input: Sentence 1:She then reached the third round of the Family Circle Cup losing to eventual champion Samantha Stosur 1 -- 6 , 6 -- 3 , 1 -- 6 , but fell early in the Internazionali BNL d'Italia to Andrea Petkovic 3 -- 6 , 0 -- 6 . Sentence 2:nan
Example Output: SINGLE_VP_COORD

Example Input: Sentence 1:Japiya Burns of The Michigan Daily was critical of Carey 's portrayal in the video , primarily her double - handkerchief bra . Sentence 2:He felt that in doing so , Carey was cheapening herself and her image to resemble younger pop singers such as Britney Spears .
Example Output:
PAIR_ANAPHORA