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Jerem Lachkar · Answer 1 · 2017-10-10T07:54:02+0000

She has to go down 4, back up to 0, and then up another 4, then back to 0.If positive 1 represents the first level above ground, negative numbers are a good choice to represent levels below ground. 8 flights; starting at -4 and moving to 4.

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