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'.

Ex Input:
Sentence 1:The duplicate Fry froze himself to return to the future and be with Leela . Sentence 2:However , when he learned that time travel paradoxes were doomed , he canceled the wedding to spare Leela the pain of his inevitable death .

Ex Output:
PAIR_CONN_ANAPHORA


Ex Input:
Sentence 1:The Example is a Caroline era stage play , a comedy written by James Shirley , first published in 1637 . Sentence 2:nan

Ex Output:
SINGLE_APPOSITION


Ex Input:
Sentence 1:Starting in early 2017 , he became the drive show host for Coast , eventually moving to breakfast host . Sentence 2:nan

Ex Output:

SINGLE_CATAPHORA