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'.

Input: Consider Input: Sentence 1:Carriers of the gene , who are healthy and normal , can be identified by a DNA test . Sentence 2:nan

Output: SINGLE_RELATIVE


Input: Consider Input: Sentence 1:Bordering the Whanganui River , it incorporates areas of Crown land , former state forest and a number of former reserves . Sentence 2:nan

Output: SINGLE_CATAPHORA


Input: Consider 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


Output: SINGLE_S_COORD