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:Marco Cecchinato was the defending champion but chose not to participate . Sentence 2:nan

SOLUTION: SINGLE_VP_COORD

PROBLEM: Sentence 1:However , he ran into trouble with a bogey at 12 and a double bogey at 13 . Sentence 2:Now leading Smith by only one shot , Jones birdied 14 and 16 .

SOLUTION: PAIR_NONE

PROBLEM: Sentence 1:It is a station on the Dublin to Waterford intercity route . Sentence 2:and was given the name MacDonagh on 10 April 1966 in commemoration of Thomas MacDonagh , one of the executed leaders of the Easter Rising of 1916 .

SOLUTION:
PAIR_CONN