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:Once again he does not have to face Asashoryu , who withdraws on Day 10 , prompting speculation about his possible retirement . Sentence 2:nan
[A]: SINGLE_RELATIVE


[Q]: Sentence 1:On the other hand , some aspects of personal infrastructure will take a comparatively shorter amount of time . Sentence 2:For example , a cell phone can be bought quickly .
[A]: PAIR_CONN


[Q]: Sentence 1:Red giant branch stars with a degenerate helium core all reach the tip with very similar core masses and very similar luminosities , although the more massive of the red giants become hot enough to ignite helium fusion before that point . Sentence 2:nan
[A]:
SINGLE_CONN_INNER