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: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 .

A: PAIR_CONN
****
Q: Sentence 1:As a result of the shortages , Venezuelans must search for food , wait in lines for hours and sometimes settle without having certain products . Sentence 2:nan

A: SINGLE_VP_COORD
****
Q: Sentence 1:From spring 1885 to summer 1886 , Wood and Lovell traveled from town to town in Michigan , designing theatrical scenery . Sentence 2:In 1886 , Wood designed the Hennepin Avenue Theater in Minneapolis , Minnesota .

A:
PAIR_NONE
****