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:APL - 61 , a non self - propelled barracks ship and lead ship of her class , moored alongside the United States Naval Academy . Sentence 2:nan
[A]: SINGLE_APPOSITION


[Q]: Sentence 1:This particular crane was unrecognized at first because it was not native to this region . Sentence 2:nan
[A]: SINGLE_CONN_INNER


[Q]: Sentence 1:The two eastern platforms at Stapleton Road will be demolished to allow trains to run faster , although it has been suggested that they be kept for use in case of service disruptions . Sentence 2:nan
[A]:
SINGLE_CONN_INNER_ANAPHORA