Which of the following polymers could not exist as isotactic and syndiotactic stereoisomers? Enter letters (A - G), corresponding to your selection. Do not enter superfluous characters, since they will be counted as incorrect answers.
A Polypropylene B Poly(methyl methacrylate) C Poly(vinylidene chloride) D Polyacrylonitrile E Poly(vinyl acetate) F Teflon G Polystyrene
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