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The arrival of which comet in 1986 was met by a series of American, Soviet, Japanese, and ESA probes?
The right answer is: Halley's Comet
The arrival of Halley's Comet in 1986 was met by a series of American, Soviet, Japanese, and ESA probes.
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Leo's 3 sisters all have daughters, and Leo has 12 nieces total. Each niece has one brother. How many nephews does Leo have?