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:There is also evidence which suggests the function of dystroglycan as a part of the signal transduction pathway because it is shown that Grb2 , a mediator of the Ras - related signal pathway , can interact with the cytoplasmic domain of dystroglycan . Sentence 2:nan
Example Output: SINGLE_APPOSITION

Example Input: Sentence 1:B Orbach and G Campbell , The Antitrust Curse of Bigness , Southern California Law Review ( 2012 ) . Sentence 2:nan
Example Output: SINGLE_APPOSITION

Example Input: Sentence 1:Statues and other forms of display made significant notice of their creator 's masculine qualities , more specifically pointing out his erect penis . Sentence 2:Therefore , to appease their god 's preferences women 's tombs and coffins displayed male qualities .
Example Output:
PAIR_CONN