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"5p a sheet for both A3 and A4 black-and -white copies and 40 p a sheet for color",
"5p a sheet for both A3 and A4 black-and -white copies and 40 p a sheet for color", this is a sentence extracted from a dialogue on photocopier.what does "p" mean in this context, and what is this sentence about?
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what's the difference among" in/on/at the forefron of"
what my question mean is : what is the difference among "in the forefront", "on the forefront", and "at the forefront-_-
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