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H2H only. Giants battle in Tokyo.
All start at max height. Pym can't shrink Past the size of a human.

Who wins and why?

http://static.comicvine.com/uploads/original/11/114513/2615533-1437456_hank_pym_large.jpg
http://upload.wikimedia.org/wikipedia/en/a/a2/Atlas_Marvel_Comics.jpg
VS
http://static.comicvine.com/uploads/square_small/0/77/155371-129232-atom-smasher.jpg
http://static.comicvine.com/uploads/original/10/105919/2134598-giganta_large.jpg

What is Giganta's max size/strength class?