Commitment To The Candy

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First and foremost, Evayna says that Violet is the most committed and knowledgeable about candy. Not only was Violet able to switch from gum-chewing to candy-bar-eating at the start of the competition, but she was the only one who knew the different candies Wonka talked about.

At one point in the film, he even holds up a yellow piece of candy and she could recognize it from across the room. Obviously, Violet would have no problem understand her supply list.