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'.
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Question: Sentence 1:In this article , he explains that although the Book of Mormon Index page used to say that the River Sidon flowed North . Sentence 2:nan

Answer: SINGLE_CONN_INNER


Question: Sentence 1:The YouTube app , which had been a default app on iOS developed by Apple , was removed . Sentence 2:nan

Answer: SINGLE_RELATIVE


Question: Sentence 1:As of February 2012 she was a student a Highfield Humanities College year 11 . Sentence 2:As of December 2012 she was attending a musical theatre course at Preston 's College .

Answer:
PAIR_ANAPHORA