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'.

Ex Input:
Sentence 1:There was some controversy about the injury , because OTAs are supposed to be non-contact . Sentence 2:nan

Ex Output:
SINGLE_CONN_INNER


Ex Input:
Sentence 1:Serving as a Royal Air Force fighter pilot in the Middle East and Europe during the Second World War , he spent months behind German lines in Italy and suffered debilitating facial and bodily wounds that remained conspicuous for the rest of his life . Sentence 2:nan

Ex Output:
SINGLE_CATAPHORA


Ex Input:
Sentence 1:After the war he joined Benito Mussolini 's National Fascist Party and participated in acts of violence against communists and socialists in the area around Lucca . Sentence 2:nan

Ex Output:

SINGLE_VP_COORD