[Q]: Sentence: Back-translation must in general be less accurate than back-calculation because linguistic symbols (words) are often ambiguous, whereas mathematical symbols are intentionally unequivocal. Question: What symbol set has a defining property of ambiguity?
++++++++++
[A]: yes

[Q]: Sentence: The high-speed observation deck elevators accelerate to a world-record certified speed of 1,010 metres per minute (61 km/h) in 16 seconds, and then it slows down for arrival with subtle air pressure sensations. Question: What does cabin pressure control do?
++++++++++
[A]: no

[Q]: Sentence: Following the controversial division of pre-partition Punjab and Bengal, rioting broke out between Sikhs, Hindus and Muslims in these provinces and spread to several other parts of India, leaving some 500,000 dead. Question: How many people died in the rioting over divisions of Bengal and Punjab?
++++++++++
[A]:
yes