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:He was also a Dutch citizen . Sentence 2:However , his son , the thirteenth Lord , became a British citizen in 1938 and later sat in the House of Lords as a Scottish Representative Peer .

Output: PAIR_CONN_ANAPHORA


Input: Consider Input: Sentence 1:Preminger contacted Robinson , who began working on the song , then visited Harburg for help with the lyrics . Sentence 2:nan

Output: SINGLE_RELATIVE


Input: Consider Input: Sentence 1:A space charge develops a potential that slows the carriers down . Sentence 2:For example , an electron approaching a cloud of other electrons will slow down due to the repulsive force .


Output: PAIR_CONN