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we bear in mind we need to measure not just the length of the life,
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but the height of the box.
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So, the area of the box here
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is 50 x 100 units,
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so whatever that is, that's 5,000.
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I'm going to get another giggle here, right.
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Imagine our little units.
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It's a quality,
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one unit of quantity--one unit of quality for a year.
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So, it's a quality year unit,
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whatever it is, 5,000 units.
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Here 6,500.