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:What is in issue will depend on the nature of the defence . Sentence 2:For example , where the defence is an alibi , the presence or absence of the accused at the particular place is crucial , and similar fact evidence could conceivably be relevant .
Example Output: PAIR_CONN

Example Input: Sentence 1:Canal locks often attract spectators , including gongoozlers , because the operation of manual canal locks is a complex affair . Sentence 2:nan
Example Output: SINGLE_CONN_INNER

Example Input: Sentence 1:The diamonding is usually found with a branch at its center or is found in the Y of a tree . Sentence 2:nan
Example Output:
SINGLE_VP_COORD