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how to edit an MP3 file and save it without re-econding it?

Hello. how can i edit a MP3 file (i use Sound Forge) without re-encoding it, but remaining in the MP3 format? This is a problem as when encoded, a few bits of silence appear at the beginning and at the end of the file, so that it cannot be looped. when i cut this silence out and try to re-save the file, then SF re-encode it and adds again the silence and so on... neverending story.
Please help.