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: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

Answer: SINGLE_CATAPHORA


Question: Sentence 1:Certain non-citizens , such as permanent residents , have similar rights ; however , non-citizens , unlike citizens , may have the right taken away . Sentence 2:For example , they may be deported if convicted of a serious crime .

Answer: PAIR_CONN_ANAPHORA


Question: Sentence 1:Understanding his plight , Shotaro takes the case to show up Ryu . Sentence 2:nan

Answer:
SINGLE_CATAPHORA