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:Although this publication offended Pendleton , he decided against replying in kind . Sentence 2:nan
Example Output: SINGLE_CONN_START

Example Input: Sentence 1:In 1919 , D'Andrea became president of the Chicago head chapter of the Unione Siciliana , a charitable organization dedicated to helping poor Sicilian immigrants . Sentence 2:However , D'Andrea used the Union as another means to increase his political base .
Example Output:
PAIR_CONN_ANAPHORA