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'.

Ex Input:
Sentence 1:They stop at an isolated gas station , where she hears him asking the clerk for directions , although he claimed to have driven the route many times . Sentence 2:nan

Ex Output:
SINGLE_CONN_INNER


Ex Input:
Sentence 1:BBC Sport. 12 November 2004 . Sentence 2:Retrieved 2 January 2007 .

Ex Output:
PAIR_NONE


Ex Input:
Sentence 1:Some of these animals are endangered or otherwise protected , and thus it is illegal to hunt them . Sentence 2:nan

Ex Output:

SINGLE_VP_COORD