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:It is eventually revealed that Nelly is Tolliver 's wife , but she left him because she could not bear being married to a gunfighter . Sentence 2:nan

Answer: SINGLE_CONN_INNER_ANAPHORA


Question: Sentence 1:Visiting Tom 's grave , Alice finds a note left by Doug which reveals the killer to be Alice 's friend Marlena Evans . Sentence 2:nan

Answer: SINGLE_CATAPHORA


Question: Sentence 1:16 May - Kenneth Nelson , a member of the Royal Ulster Constabulary ( RUC ) was shot dead by the Provisional Irish Republican Army ( PIRA ) in Derryfubble , near Benburb . Sentence 2:nan

Answer:
SINGLE_APPOSITION