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:The common solution to this problem is to use an LR parser , which is a type of shift - reduce parser , and does bottom - up parsing . Sentence 2:nan

Output: SINGLE_RELATIVE


Input: Consider Input: Sentence 1:Writers like Faulkner , who won the Nobel Prize in Literature in 1949 , also brought new techniques such as stream of consciousness and complex narrative techniques to their writings . Sentence 2:nan

Output: SINGLE_RELATIVE


Input: Consider Input: Sentence 1:BBC Sport. 12 November 2004 . Sentence 2:Retrieved 2 January 2007 .


Output: PAIR_NONE