The sentence Time flies like an arrow is surely unambiguous if there ever was an unambiguous sentence (ignoring the difference between literal and metaphorical meanings, which have nothing to do with syntax). But to the surprise of the programmers, the sharp-eyed computer found it to have five different trees! Time proceeds as quickly as an arrow proceeds, (the intended reading) Measure the speed of flies in the same way that you measure the speed of an arrow. Measure the speed of flies in the same way that an arrow measures the speed of flies. Measure the speed of flies that resemble an
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