slipping down the stairs
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slipping down the stairs
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going down stairs sideways
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tripping up the stairs
slipping down the stairs, slipped and fell down the stairs, sliding down the stairs, going down the stairs, slip and fall on stairs, slide down the stairs, falling down the stairs, going up and down stairs on bottom, walking down the stairs, running down the stairs, falls down the stairs, going down stairs sideways, walk up and down stairs, tripping up the stairs