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'.

Sentence 1:The contract was expected to be completed in four years , but the headings met on 20 April 1954 with the concrete lining finished a month later . Sentence 2:nan
SINGLE_S_COORD

Sentence 1:Speculation is that it was never finished because Warrior had already left WWF or because Hasbro was unable to perfect the chest beating action . Sentence 2:nan
SINGLE_CONN_INNER

Sentence 1:The argument would be that an electrical device is not complete because it does not function unless the electricity is turned on . Sentence 2:nan

SINGLE_CONN_INNER_ANAPHORA