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:Andy had several love interests through the show 's run , but his first romantic relationship on the series is Ellie Walker ( Elinor Donahue ) , a newcomer to town who works in her uncle 's drug store . Sentence 2:nan

A: SINGLE_S_COORD_ANAPHORA
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Q: Sentence 1:This sura , which consists of seven verses , is the most often recited sura of the Quran : Sentence 2:nan

A: SINGLE_RELATIVE
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Q: Sentence 1:Lewis antigens are red blood cell antigens which are not produced by the cell itself . Sentence 2:Instead , Lewis antigens are components of exocrine epithelial secretions , and are subsequently adsorbed onto the surface of the red cell .

A:
PAIR_CONN_ANAPHORA
****