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:The presence of nitrogen dioxide is necessary for the reaction to proceed at a reasonable rate . Sentence 2:The process is highly exothermic , and a major consideration of the design of the chambers was to provide a way to dissipate the heat formed in the reactions .

Ex Output:
PAIR_NONE


Ex Input:
Sentence 1:In July , magistrates in Naples placed Lino Jannuzzi , a 76 - year - old journalist and senator , under house arrest , although they allowed him the possibility of attending the work of the parliament during daytime . Sentence 2:nan

Ex Output:
SINGLE_CONN_INNER_ANAPHORA


Ex Input:
Sentence 1:Nothing Sado does is pleasing to the king , who proceeds to humiliate his son . Sentence 2:However , the Royal Queen Dowager is overjoyed at Sado 's wisdom and acts as his protector .

Ex Output:

PAIR_CONN_ANAPHORA