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:For large numbers , the Poisson distribution approaches a normal distribution about its mean , and the elementary events ( photons , electrons , etc . ) are no longer individually observed , typically making shot noise in actual observations indistinguishable from true Gaussian noise . Sentence 2:nan

Ex Output:
SINGLE_S_COORD


Ex Input:
Sentence 1:Lulu notices this , so she plans to get to Mamoru after he leaves the planetarium , but Amu sees her . Sentence 2:nan

Ex Output:
SINGLE_S_COORD


Ex Input:
Sentence 1:On 30 November 1967 , the state of South Yemen was formed , comprising Aden and the former Protectorate of South Arabia . Sentence 2:This socialist state was later officially known as the People 's Democratic Republic of Yemen and a programme of nationalisation was begun .

Ex Output:

PAIR_ANAPHORA