Solve the riddle:
Upon me you can tread, though softly under cover.
And I will take you places, that you have yet to discover.
I’m high, and I’m low, though flat in the middle.
And though a joy to the children, adults think of me little.
What am I?

Below you will find a hint and the correct answer to the riddle.
Little hint:
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Hint: St*i*s.
Right answer:
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Answer: Stairs.