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:This topological space is zero - dimensional , and in particular , each point is an irreducible component . Sentence 2:nan

Output: SINGLE_S_COORD


Input: Consider Input: Sentence 1:The YouTube app , which had been a default app on iOS developed by Apple , was removed . Sentence 2:nan

Output: SINGLE_RELATIVE


Input: Consider Input: Sentence 1:Navin asked Ruth to come to Detroit for an interview . Sentence 2:However , Ruth balked , since Walsh had already arranged for him to take part in a celebrity golf tournament in Hawaii .


Output: PAIR_CONN_ANAPHORA