instruction:
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'.
question:
Sentence 1:The Tweedmouth junction faced south , so that Berwick to Kelso trains had to reverse there . Sentence 2:nan
answer:
SINGLE_CONN_INNER


question:
Sentence 1:Nothing Sado does is pleasing to the king , who proceeds to humiliate his son . Sentence 2:However , the Royal Queen Dowager is overjoyed at Sado 's wisdom and acts as his protector .
answer:
PAIR_CONN_ANAPHORA


question:
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 .
answer:

PAIR_CONN_ANAPHORA