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:Russians were strongly tied to tradition and feared they would lose their long cherished personal connection to the Tsar . Sentence 2:While the Tsar remained ever pure in the eyes of the people , popular opinion held that his advisors exercised an evil influence over him .
Example Output: PAIR_NONE

Example Input: Sentence 1:The bronze sculpture was created in 1927 and dedicated on July 5 , 1930 . Sentence 2:nan
Example Output: SINGLE_VP_COORD

Example Input: Sentence 1:The overwhelming pre-race favorite Sven Kramer , who had won 18 consecutive 10,000 m races since 2006 , was disqualified due to a missed lane change after 6600 m into the race . Sentence 2:nan
Example Output:
SINGLE_RELATIVE