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:Bean 's Langtry is not named for the English actress Lillie Langtry , who visited there after Bean 's death . Sentence 2:Instead , Langtry is named for George Langtry , an engineer and foreman of the Southern Pacific Railroad who had supervised a Chinese work crew there .

Ex Output:
PAIR_CONN_ANAPHORA


Ex Input:
Sentence 1:In this article , he explains that although the Book of Mormon Index page used to say that the River Sidon flowed North . Sentence 2:nan

Ex Output:
SINGLE_CONN_INNER


Ex Input:
Sentence 1:Although the principal focus was straight plays , he revived the melodrama -- a play with incidental music . Sentence 2:nan

Ex Output:

SINGLE_CONN_START