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'.

Input: Consider 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 .

Output: PAIR_NONE


Input: Consider 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

Output: SINGLE_APPOSITION


Input: Consider Input: Sentence 1:Throughout the Republic , the administrative system was revised several times to comply with new demands . Sentence 2:In the end , it proved inefficient for controlling the ever - expanding dominion of Rome , contributing to the establishment of the Roman Empire .


Output: PAIR_CONN_ANAPHORA