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'.

Q: Sentence 1:However , Nasir ud din Mahmud died suddenly in 1229 CE , and Iltutmish was at a loss as to a successor , because he felt that none of his several surviving sons . Sentence 2:nan

A: SINGLE_CONN_INNER_ANAPHORA
****
Q: Sentence 1:Amy Gumm continues her crusade against Dorothy Gale and Glinda after a failed assassination attempt . Sentence 2:After escaping from a burning Emerald City , the flying monkeys Ollie and Maude use their newly created paper wings in attempt to carry Princess Ozma and Amy to safety .

A: PAIR_ANAPHORA
****
Q: Sentence 1:Although most of his work went unpublished , Taylor was the first psychologist known to use exposure therapy treatment for anxiety , including methods of situational exposure with response prevention -- a common exposure therapy technique still being used . Sentence 2:nan

A:
SINGLE_CONN_START
****