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:As part of that activism , Matiu Dickson served four terms on city councils . Sentence 2:Additionally , he chaired the Te Runanga o Kirikiriroa Charitable Trust .

Answer: PAIR_CONN_ANAPHORA


Question: Sentence 1:Since the transition , it has been , however , extremely rare for a text to be written predominantly in classical Chinese , mainly because it lacks in words essential to describing modern life or expressing Western - originated concepts . Sentence 2:nan

Answer: SINGLE_CONN_INNER_ANAPHORA


Question: Sentence 1:Aminopterin ( or 4 - aminopteroic acid ) , the 4 - amino derivative of folic acid , is an antineoplastic drug with immunosuppressive properties often used in chemotherapy . Sentence 2:nan

Answer:
SINGLE_APPOSITION