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:As word spread about Audrey , hundreds of visitors began coming to pray for healing near Audrey 's bedside . Sentence 2:Eventually , the family set up visiting hours and built a window in Audrey 's bedroom wall through which visitors could view her .
Example Output: PAIR_CONN_ANAPHORA

Example Input: Sentence 1:However , there are state laws that exceed this 50 per cent limit and these are under litigation in the Supreme Court . Sentence 2:nan
Example Output: SINGLE_S_COORD

Example Input: Sentence 1:Although such a thing is not possible today , it represents a holy grail for researchers into cognitive models of information retrieval . Sentence 2:nan
Example Output:
SINGLE_CONN_START