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:After the conclusion of this most unfortunate episode in Delhi 's history , Nader 's officials began collecting taxes and some were also sent out to Delhi 's environs to do the same . Sentence 2:nan
answer:
SINGLE_S_COORD


question:
Sentence 1:Constantine was appointed to the BBC 's General Advisory Committee in 1966 and became a BBC Governor two years later , although declining health restricted his involvement . Sentence 2:nan
answer:
SINGLE_CONN_INNER_ANAPHORA


question:
Sentence 1:The limestone contains marine fossils including crinoids , brachiopods , gastropods , horn corals , and bryozoans . Sentence 2:However , most of the fossils are too small for the human eye to detect .
answer:

PAIR_CONN