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:The first thematic group is striking for the breadth of its melodic content , which is not usual for any symphony , and is not found in Enescu 's previous four essays in the form . Sentence 2:nan
Example Output: SINGLE_RELATIVE

Example Input: Sentence 1:As a result of the shortages , Venezuelans must search for food , wait in lines for hours and sometimes settle without having certain products . Sentence 2:nan
Example Output: SINGLE_VP_COORD

Example Input: Sentence 1:The two bonded over the accident and Ben soon started to date Yvonne 's daughter Tania Jeffries ( Faye Smythe ) . Sentence 2:However the polar opposite relationship did not last and it soon became clear Ben was more interested in Yvonne than Tania .
Example Output:
PAIR_CONN_ANAPHORA