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:Neuroblastoma is an aggressive cancer of immature neuroblastic cells ( precursors of neurons ) , and is one of the most common pediatric cancers , with a median age at diagnosis of two years . Sentence 2:nan

A: SINGLE_S_COORD
****
Q: Sentence 1:The principal consecrator was Metropolitan Maxim Hermaniuk . Sentence 2:Bishop Yakymyshyn retired on June 1 , 2007 , after reaching of the age limit .

A: PAIR_NONE
****
Q: Sentence 1:A PV is normally real media but it can be a disk image or even an AppleRAID Set . Sentence 2:nan

A:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
SINGLE_S_COORD_ANAPHORA
****
