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'.

[Q]: Sentence 1:Returning to Moldavia in 1857 , he was extremely active as an administrator , deputy , and professor after the unification of Moldavia and Wallachia ( in 1859 - 1861 ) in agrarian reform , agricultural education , and economic and statistical research . Sentence 2:nan
[A]: SINGLE_CATAPHORA


[Q]: Sentence 1:He then joined Madras Christian College but quit , returned to Sri Lanka and took up law studies . Sentence 2:nan
[A]: SINGLE_VP_COORD


[Q]: Sentence 1:Hikaru shields them , and he tries to fire another . Sentence 2:This time Lafarga steps in and shields Hikaru .
[A]:
PAIR_NONE