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:Although he never flew into space , he served as a backup crew member on the Soyuz 16 , Soyuz 32 , Soyuz 35 , and Soyuz T - 4 missions . Sentence 2:nan

Output: SINGLE_CONN_START


Input: Consider Input: Sentence 1:Going back to general quarters for the dawn alert at 0525 on the 29th , Bunch spotted planes at 0605 , but they remained out of range . Sentence 2:nan

Output: SINGLE_CATAPHORA


Input: Consider Input: Sentence 1:Calvi told Mojo magazine that whereas Anna Calvi was recorded on and off over three years . Sentence 2:nan


Output: SINGLE_CONN_INNER_ANAPHORA