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:Principal photography took place in Algiers at actor Jacques Perrin 's suggestion , which the filmmakers approved for its Mediterranean environment and because the Ministry of Culture was accommodating . Sentence 2:nan
Example Output: SINGLE_CONN_INNER

Example Input: Sentence 1:The song is frequently sung in The Return of Peter Grimm , an RKO film released in 1935 , and the second screen adaptation of David Belasco 's Broadway hit . Sentence 2:nan
Example Output: SINGLE_APPOSITION

Example Input: Sentence 1:With the growing importance of shipping on Lake Erie in the 19th century , Presque Isle became home to several lighthouses and what became a United States Coast Guard station . Sentence 2:nan
Example Output:
SINGLE_S_COORD