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'.

Sentence 1:APL - 61 , a non self - propelled barracks ship and lead ship of her class , moored alongside the United States Naval Academy . Sentence 2:nan
SINGLE_APPOSITION

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 .
PAIR_CONN_ANAPHORA

Sentence 1:It was formerly numbered State Route 69 . Sentence 2:North of Avenue 364 ( Tulare County ) , State Route 245 is synonymous with Millwood Drive .

PAIR_NONE