instruction:
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'.
question:
Sentence 1:Throughout the Republic , the administrative system was revised several times to comply with new demands . Sentence 2:In the end , it proved inefficient for controlling the ever - expanding dominion of Rome , contributing to the establishment of the Roman Empire .
answer:
PAIR_CONN_ANAPHORA


question:
Sentence 1:Although such a thing is not possible today , it represents a holy grail for researchers into cognitive models of information retrieval . Sentence 2:nan
answer:
SINGLE_CONN_START


question:
Sentence 1:While Father Mukada is away from Oz , Kirk begins talking to the evangelical Reverend Jeremiah Cloutier who convinces Kirk to renounce his Catholic faith and join his flock . Sentence 2:However , Kirk becomes overzealous and attacks those inmates who do n't share his beliefs .
answer:

PAIR_CONN_ANAPHORA