[Q]: Sentence: The headquarters of the GLA is City Hall, Southwark; the mayor is Boris Johnson. Question: Who is the current Mayor of London?
++++++++++
[A]: yes

[Q]: Sentence: They imported livestock, fruit trees and vegetables, and built a chapel and one or two houses. Question: What was imported by the settlers of the island?
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[A]: yes

[Q]: Sentence: A defect can turn into a failure when the environment is changed. Question: What is the result of the programmer making a mistake?
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[A]:
no