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user112326
Bit late, but if you have this in future I found most success by, preserving as much of the seatpost as possible, then using a heat gun on the post itself. I think aluminium heats up faster/expands more than the steel and so starts to break some of the bonds as it cools, then add water and lubricant to speed that up (you can hold it upside down and put some in through the seat tube bottle bosses as well). Finally put the post in a bench vice and twist the frame. Usually does the trick.