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'.

Q: Sentence 1:Admitting that Owen was innocent , they laid the crime on him . Sentence 2:nan

A: SINGLE_CATAPHORA
****
Q: Sentence 1:However , in retrospect the Marquette poll accurately reflected the Wisconsin electorate 's vote . Sentence 2:However , the same poll showed President Obama holding a lead over Mitt Romney 51 - 43 .

A: PAIR_CONN
****
Q: Sentence 1:Since altitude and depth are determined by the normal to the Earth 's surface , locations sharing the same latitude -- but having different elevations ( e.g. , lying along this normal ) -- no longer lie within this plane . Sentence 2:nan

A:
SINGLE_CONN_START
****