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inside an area or space
in the city, in the sky, in bed
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in contact with a surface
on the wall, on the table
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close to
at the table, at the bus stop
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on a line
on the river, on the equator
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before nouns referring to a place or position
at the top, at the front, at the end
but in the middle
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arrive in a city
arrive in London, in Amsterdam
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arrive at a small place
arrive at the station, at the meeting
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when expressing 'towards'
point at something, smile at someone
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