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In the UK (not that this makes a difference)... there are 2 types, the 2-track and the maxi.
2-tracks only have .. well, 2 tracks. An A-side, then a B-side or a remix. I think the total time has to be under 10mins, otherwise its not allowed to count towards the chart.
Maxi singles are everything else, so there are at least 3 tracks. Can have B-sides, or remixes, or a video (though there are rules about what is allowed).
So in the UK its never anything to do with the physical size of the single, its just a maxi-single if it's not a 2-track :p
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