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:Scott received his B.S. degree from Massachusetts Institute of Technology and graduated with a J.D. from the University of California , Los Angeles . Sentence 2:He has taught as a law professor at Southwestern Law School .

Ex Output:
PAIR_ANAPHORA


Ex Input:
Sentence 1:Professor Amamori discovers a 10th planet in the Earth 's solar system , which he names La - Metal , while at his observatory in Tokyo . Sentence 2:nan

Ex Output:
SINGLE_RELATIVE


Ex Input:
Sentence 1:The accuracy of the drawings in that work ( actually , two works , by father and son ) leaves much to be desired . Sentence 2:For example , the corridor containing Barbatus ' coffin is shown complete , when it has always ended in the rock ledge .

Ex Output:

PAIR_CONN