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Masteryoshi Masteryoshi
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6 years ago
For safety reasons, all risers in a flight of stairs should be:
 
   Four inches high
   The same height
   Ten inches high
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zhixuan t.zhixuan t.
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6 years ago
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Masteryoshi Author
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#2
6 years ago
Thank you so very much, was really helpful and kind of you to answer
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