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:As a result , Ibrahim Khan invited Mr. Charnock back to Bengal ; but Mr. Charnock refused to come back until a specific Firman with terms and conditions clearly specified was issued by the Emperor so that they would not be subjected to further humiliations . Sentence 2:nan
[A]: SINGLE_CONN_INNER_ANAPHORA


[Q]: Sentence 1:However , in retrospect the Marquette poll accurately reflected the Wisconsin electorate 's vote . Sentence 2:However , the same poll showed President Obama holding a lead over Mitt Romney 51 - 43 .
[A]: PAIR_CONN


[Q]: Sentence 1:They stop at an isolated gas station , where she hears him asking the clerk for directions , although he claimed to have driven the route many times . Sentence 2:nan
[A]:
SINGLE_CONN_INNER