instruction:
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'.
question:
Sentence 1:He is a recipient of a Bay Area Critics Circle award and is a writer in residence with the LA Writer 's Center . Sentence 2:nan
answer:
SINGLE_S_COORD


question:
Sentence 1:The fluid pumping efficiency of a valveless system , however , is not necessarily lower than that having valves . Sentence 2:In fact , many fluid - dynamical systems in nature and engineering more or less rely upon valveless pumping to transport the working fluids therein .
answer:
PAIR_CONN


question:
Sentence 1:PP 15 -- 65 Woman 's Role in Economic Development . Sentence 2:Male and female farming systems .
answer:

PAIR_NONE