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'.

Example Input: Sentence 1:Certain non-citizens , such as permanent residents , have similar rights ; however , non-citizens , unlike citizens , may have the right taken away . Sentence 2:For example , they may be deported if convicted of a serious crime .
Example Output: PAIR_CONN_ANAPHORA

Example Input: Sentence 1:In February 1946 , Heman Marion Sweatt , an African American man , applied to the University of Texas School of Law . Sentence 2:He was denied admission because of race , and subsequently filed suit in Sweatt v. Painter ( 1950 ) .
Example Output: PAIR_ANAPHORA

Example Input: Sentence 1:S. angustirostris was one of the largest herbivores of the Nemegt Formation , which lacked large horned dinosaurs , but had sauropods and a more diverse theropod fauna . Sentence 2:nan
Example Output:
SINGLE_RELATIVE