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:She is married to Noman sheikh , couple have four children . Sentence 2:She was married at a very young age and only has High school diploma .
Example Output: PAIR_ANAPHORA

Example Input: Sentence 1:Duncan MacDuff later married Mary , the niece of King Edward , and threw in his lot against the Bruce . Sentence 2:nan
Example Output: SINGLE_APPOSITION

Example Input: Sentence 1:Another source of surnames was the Swedish allotment system , which from the mid-late 17th century was organised to maintain a standing army , and where a number of farms were grouped together and then supported a soldier with a small cottage and piece of land . Sentence 2:nan
Example Output:
SINGLE_RELATIVE