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:Fallen Empires was the last set produced only in English although the two previous sets . Sentence 2:nan
answer:
SINGLE_CONN_INNER


question:
Sentence 1:Psu.com. 2003 - 12 - 10 . Sentence 2:Archived from the original on 2013 - 05 - 07 .
answer:
PAIR_NONE


question:
Sentence 1:De Robertis carried out his postdoctoral training ( 1974 -- 1977 ) with Sir John Gurdon , the distinguished developmental biologist , at the Medical Research Council in the United Kingdom . Sentence 2:nan
answer:

SINGLE_APPOSITION