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'.

Example Input: Sentence 1:Since it was built , volunteers have given sailing experience to thousands of members and guests of the Beacon Sloop club for free . Sentence 2:nan
Example Output: SINGLE_CONN_START

Example Input: Sentence 1:Once again he does not have to face Asashoryu , who withdraws on Day 10 , prompting speculation about his possible retirement . Sentence 2:nan
Example Output: SINGLE_RELATIVE

Example Input: Sentence 1:Gathering 4 other girls - Hilda , Azusa , Honoka and Aoi , they form the 5 Fairies of Light and manages to track down the Yople at an amusement park where Tojo was working as part of the cast in a Gohan - kun theatre drama . Sentence 2:nan
Example Output:
SINGLE_CATAPHORA