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: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:Lovegrass is the fifth studio album by Australian country music singer Sara Storer . Sentence 2:It was released in August 2013 and peaked at number 25 on the ARIA Charts .
PAIR_ANAPHORA

Sentence 1:Rookie quarterback Joe Ferguson , who eventually would be the Bills starting quarterback for 12 seasons , started all 14 games at quarterback . Sentence 2:nan

SINGLE_RELATIVE