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:In 1991 , an English man was prosecuted for allegedly having sexual contact with a dolphin . Sentence 2:The man was found not guilty after it was revealed at trial that the dolphin was known to tow bathers through the water by hooking his penis around them .

Output: PAIR_ANAPHORA


Input: Consider Input: Sentence 1:Lang is forlorn but is unable to convince her to stay . Sentence 2:nan

Output: SINGLE_S_COORD


Input: Consider Input: Sentence 1:The architect of the Ethiopian version was Wehib Pasha , who had been a general in the army of the Ottoman Empire , and was serving as Ras Nasibu 's Chief - of - Staff for the southern front . Sentence 2:nan


Output: SINGLE_RELATIVE