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: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 .
[EX A]: PAIR_ANAPHORA

[EX Q]: Sentence 1:Supposedly invented by Leonardo da Vinci , the Italian Renaissance man , the wheellock action was an innovation that was not widely adopted due to the high cost of the clockwork mechanism . Sentence 2:nan
[EX A]: SINGLE_APPOSITION

[EX Q]: Sentence 1:Friends and colleagues met Williams in Europe , with the last meetings occurring in the mid 1970s in Salzburg , Austria . Sentence 2:In 1972 , he accepted and then later declined a post at the Latter Day Saints Hospital in Salt Lake City Utah , United States .
[EX A]:
PAIR_ANAPHORA