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:Vidyapati tried his best , but could not locate the place of worship . Sentence 2:Finally , he could manage to marry Lalita , the daughter of Viswabasu .
Example Output: PAIR_CONN_ANAPHORA

Example Input: Sentence 1:The sixth stage was originally scheduled to be 265 km ( 165 mi ) in length , but it was shortened the day before it was to be run . Sentence 2:nan
Example Output: SINGLE_S_COORD_ANAPHORA

Example Input: Sentence 1:With Napier out , Quarles is ruined and goes to Limehouse for protection . Sentence 2:nan
Example Output:
SINGLE_VP_COORD