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: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 ) .
answer:
PAIR_ANAPHORA

question:
Sentence 1:After consulting the Army Corps of Engineers , a quick decision was made to open the floodgates to permit the rising water flow into the Mississippi , hence relieving pressure on the levees . Sentence 2:nan
answer:
SINGLE_CONN_INNER

question:
Sentence 1:Briefly appointed to the Cabinet in early October 1973 , before Trygve Bratteli formed his second cabinet . Sentence 2:During this short period he was replaced by Birgit Wiig .
answer:
PAIR_ANAPHORA