We buy and sell at the same time, locking in our tiny profits but making many, many, of them each and every day on those tiny price differences between different markets.

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"He would make a big funny loop off the usual route and we knew it was time to start locking down on him, " she said.

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At about the same time, Quanta suggested a locking mechanism for the laptop that designers thought was not child-friendly or durable enough.

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