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:This particular crane was unrecognized at first because it was not native to this region . Sentence 2:nan
Example Output: SINGLE_CONN_INNER

Example Input: Sentence 1:As a major he held a number of posts , the most notable being the brigade major of an infantry brigade , even though he was a part of the artillery corps . Sentence 2:nan
Example Output: SINGLE_APPOSITION

Example Input: Sentence 1:Where loads other than BS 1363 sockets are connected to a ring circuit or it is desired to place more than one socket for low power equipment on a spur , a BS 1363 fused connection unit ( FCU ) is used . Sentence 2:nan
Example Output:
SINGLE_S_COORD_ANAPHORA