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:Fort Frank on Carabao Island was assaulted on 16 April by the 1st Battalion of the 151st Infantry and Co. C of the 113th Engineer Battalion . Sentence 2:However , the Japanese had escaped to the mainland .
Example Output: PAIR_CONN

Example Input: Sentence 1:Jack gets an opportunity to work as a chef on a cruise ship and the girls jeopardize their friendship over who Jack can take as his one guest . Sentence 2:nan
Example Output: SINGLE_S_COORD_ANAPHORA

Example Input: Sentence 1:Barzola faced Arnold Allen at UFC 220 on January 20 , 2018 . Sentence 2:However , Allen was pulled from the fight on January 11 due to alleged visa issues which restricted his ability to travel , and he was replaced by Matt Bessette .
Example Output:
PAIR_CONN_ANAPHORA