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:However , because Kanako found out Mariya 's secret before she began attending the school , it was null , and because Kanako knew Shizu 's true gender . Sentence 2:nan

Ex Output:
SINGLE_CONN_INNER


Ex Input:
Sentence 1:Some people have claimed that members of Operation Vanguard have been meting out selective punishment to galamseyers . Sentence 2:Unproven allegations of bribe - taking have been leveled against some service men of the operation .

Ex Output:
PAIR_NONE


Ex Input:
Sentence 1:Frederic H. Spaulding , the former principal of Tampa 's Hillsborough High School , founded the private Tampa Junior College in 1931 to serve as one of the first institutions of higher education in the Tampa Bay area . Sentence 2:nan

Ex Output:

SINGLE_APPOSITION