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'.

[EX Q]: Sentence 1:Ambulocetus was the size of a male sea lion , much larger than Pakicetus . Sentence 2:Thewissen et al. estimated the body weight of Ambulocetus at 141 -- 235 kg ( 311 -- 518 lb ) , while Philip D. Gingerich estimated it at 720 kg ( 1,590 lb ) .
[EX A]: PAIR_ANAPHORA

[EX Q]: Sentence 1:GM executives decided that engineering effort would best be spent on aerodynamics and chassis development . Sentence 2:They created a modern platform , so that when engine technology advanced , they would have a well - balanced package with acceleration , braking , handling , and aerodynamics .
[EX A]: PAIR_ANAPHORA

[EX Q]: Sentence 1:Although still an island by name , Deer Island has been connected to the mainland since the former Shirley Gut channel , which once separated the island from the town of Winthrop , was filled in by the 1938 New England hurricane . Sentence 2:nan
[EX A]:
SINGLE_CONN_START