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'.

Sentence 1:She told Ben Lee of Digital Spy that an actor had been cast , although she refused to reveal his identity . Sentence 2:nan
SINGLE_CONN_INNER

Sentence 1:She once ran for the presidency of the conference but was defeated by another woman . Sentence 2:nan
SINGLE_VP_COORD

Sentence 1:Arthur later explains to them that Mordred survived because Lancelot was unwilling to kill Arthur 's son . Sentence 2:nan

SINGLE_CONN_INNER