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'.
--------
Question: Sentence 1:Some evidence suggests that Barbados may have been settled in the second millennium BC , but this is limited to fragments of conch lip adzes found in association with shells that have been radiocarbon - dated to about 1630 BC . Sentence 2:nan

Answer: SINGLE_S_COORD


Question: Sentence 1:In some situations , they have been accompanied , or followed , by civil unrest and armed rebellion . Sentence 2:nan

Answer: SINGLE_VP_COORD


Question: Sentence 1:Strong , who had known Pico since 1867 , purchased the property and had it restored in 1909 . Sentence 2:nan

Answer:
SINGLE_RELATIVE