Cramer's lightning round: Carvana is not a buy

• It's that time again! "Mad Money" host Jim Cramer rings the lightning round bell, which means he's giving his answers to callers' stock questions at rapid speed.

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Carvana Co: "It's too hard for me. ... We're looking for high-quality situations."

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Manchester United PLC: "It's too late. ... The ship has sailed."

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