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:Moderate Party Chairman Ken Block , who received 6.5 % of the vote in the 2010 gubernatorial election , had filed to run again for the Moderate Party . Sentence 2:nan
Example Output: SINGLE_RELATIVE

Example Input: Sentence 1:Sakhr was wounded in the process and died of his wounds a year later . Sentence 2:nan
Example Output: SINGLE_VP_COORD

Example Input: Sentence 1:Student groups were a key part of the political scene during this period . Sentence 2:Upon taking office after Suharto stepped down , B.J.
Example Output:
PAIR_NONE