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:Harold tries , but Farrell makes a fool of him , then has him tied up . Sentence 2:Harold 's sworn enemy , Hank Hooper , pelts him and accidentally starts a fire that consumes the medicine show wagon .
Example Output: PAIR_ANAPHORA

Example Input: Sentence 1:Once again he does not have to face Asashoryu , who withdraws on Day 10 , prompting speculation about his possible retirement . Sentence 2:nan
Example Output: SINGLE_RELATIVE

Example Input: Sentence 1:Following suit , Li Chongxun first killed his siblings , but as he prepared to kill his wife , she hid under the curtains of her bedroom . Sentence 2:nan
Example Output:
SINGLE_S_COORD_ANAPHORA