TASK DEFINITION: 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'.
PROBLEM: Sentence 1:Starting in 1955 , he served the University of the West Indies ( UWI ) as a lecturer in adult education and as a professor of Spanish and director of the Extra-Mural Studies Department . Sentence 2:nan

SOLUTION: SINGLE_CATAPHORA

PROBLEM: Sentence 1:After gathering information from the public , the mystery man was revealed to be Kisaburo Sasamoto , a physicist and former college mate of Rinna , as well as her boyfriend back in America . Sentence 2:However , his whereabouts were unknown after he graduated .

SOLUTION: PAIR_CONN_ANAPHORA

PROBLEM: Sentence 1:He defeated the challenger from the Conservative Party , O.J. Sentence 2:Lewis , with a majority of 25,206 .

SOLUTION:
PAIR_NONE