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'.
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Question: Sentence 1:They work in groups consisting of on average 2 - 4 people , sharing work equally . Sentence 2:They use resources such as internet , PowerPoint presentations and videos to learn , instead of a teacher standing up in front of the room doing a lecture every day .

Answer: PAIR_NONE


Question: Sentence 1:Although cryoseisms release less energy than most tectonic events , they can still cause damage or significant changes to an affected area . Sentence 2:nan

Answer: SINGLE_CONN_START


Question: Sentence 1:Debuting in Shadow of the Hawk , he stalked both a man calling himself Carter Hall ( and claiming to be the reincarnated Hawkman ) and Shayera ( the former Hawkgirl ) to Egypt . Sentence 2:nan

Answer:
SINGLE_CATAPHORA