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'.

[EX 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
[EX A]: SINGLE_CONN_INNER_ANAPHORA

[EX Q]: Sentence 1:A server becomes a candidate if it receives no communication by the leader over a period called the election timeout , so it assumes there is no acting leader anymore . Sentence 2:nan
[EX A]: SINGLE_S_COORD_ANAPHORA

[EX Q]: Sentence 1:Due to the greater stability of Win2K compared with WinME , which was released near 2000 , 2K - tan is often described as the guardian of ME - tan . Sentence 2:nan
[EX A]:
SINGLE_RELATIVE