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:A few years later another merger was attempted as the Country - National Organisation but this failed within a few years . Sentence 2:nan
Example Output: SINGLE_S_COORD

Example Input: Sentence 1:Bean 's Langtry is not named for the English actress Lillie Langtry , who visited there after Bean 's death . Sentence 2:Instead , Langtry is named for George Langtry , an engineer and foreman of the Southern Pacific Railroad who had supervised a Chinese work crew there .
Example Output: PAIR_CONN_ANAPHORA

Example 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
Example Output:
SINGLE_CATAPHORA