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:Hearing about the Untold Legend series , Byrne contacted editor Paul Levitz to express interest . Sentence 2:nan
SINGLE_CATAPHORA

Sentence 1:By May , negotiations had led the government to agree to support the Nasir group against Garang . Sentence 2:However , support for an attempt to remove Garang fell among other SPLA commanders , who felt that a coup attempt would further weaken the movement .
PAIR_CONN

Sentence 1:Agriculture and trade flourished in these centuries , and Piacenza became one of the richest cities in Europe . Sentence 2:nan

SINGLE_S_COORD