"within" and "inside" are very similar, however there is ONE major difference between them. That is:
"inside" usually uses mostly for things that have physical boundary, for examples:
inside a house, inside a box, inside a car, ...
"within" is more common for things that have less physical boundary, for examples:
within 2 miles, within one hour, ...
"among" is used for three or more than three things.
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