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:He is also a partner of Burlywood Capital . Sentence 2:Additionally , he is the President of the Tourism Alliance , and the Institute of Hospitality .
Example Output: PAIR_CONN_ANAPHORA

Example Input: Sentence 1:Although he studied painting and drawing in the 1970s and 1980s , he is a self - taught sculptor who began showing his work regularly in 2000 . Sentence 2:nan
Example Output: SINGLE_CONN_START

Example Input: Sentence 1:It called on both States to negotiate in good faith in order to ensure the achievement of the objectives of the 1977 Budapest Treaty , which it declared was still in force , while taking account of the factual situation that had developed since 1989 . Sentence 2:nan
Example Output:
SINGLE_RELATIVE