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:B Orbach and G Campbell , The Antitrust Curse of Bigness , Southern California Law Review ( 2012 ) . Sentence 2:nan

A: SINGLE_APPOSITION
****
Q: Sentence 1:Bernard reluctantly attempts to call the son of his mother 's employer , with whom he 'd had a sexual encounter as a teenager , while Emory calls a dentist on whom he 'd had a crush while in high school . Sentence 2:nan

A: SINGLE_CONN_INNER_ANAPHORA
****
Q: Sentence 1:Prior to the new album 's release , band members said the album 's name would be called ' Jacket on the Rack ' . Sentence 2:However , it was changed to Volume 4 : Songs in the Key of Love & Hate .

A:
PAIR_CONN
****