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:At the Barcelona Open Banco Sabadell , he was able to reach the quarterfinals , losing to Nicolas Almagro . Sentence 2:However , he fell early at the Mutua Madrid Open and the Internazionali BNL d'Italia .
[EX A]: PAIR_CONN

[EX Q]: Sentence 1:Galvanized steel offers more protection from rust , so this is usually used when the gusset plate is exposed to the elements . Sentence 2:nan
[EX A]: SINGLE_S_COORD

[EX Q]: Sentence 1:Although unable to defy his critics by winning a fifth Heavyweight title , Holyfield refused to be backed up by the young champion and even rattled him in the closing part of the 12th round . Sentence 2:nan
[EX A]:
SINGLE_CONN_START