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:Melissa , who had stepped up as a leader , was named the red team 's best of the worst and told to nominate two women for elimination . Sentence 2:nan

Ex Output:
SINGLE_RELATIVE


Ex Input:
Sentence 1:When Morgan accidentally squirts tomato ketchup over Billie 's hoody , Liam tries to wash off the stain but is caught by Carol ; who slaps him on his face , causing his forehead to bleed . Sentence 2:nan

Ex Output:
SINGLE_VP_COORD


Ex Input:
Sentence 1:Journal of translational medicine . Sentence 2:12 : 129 .

Ex Output:

PAIR_NONE