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:Jack gets an opportunity to work as a chef on a cruise ship and the girls jeopardize their friendship over who Jack can take as his one guest . Sentence 2:nan

SOLUTION: SINGLE_S_COORD_ANAPHORA

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:GSH is an important cellular antioxidant . Sentence 2:Therefore , what exactly the key roles are for these cataractogenic factors is not yet fully understood or agreed upon by researchers .

SOLUTION:
PAIR_CONN