Vanessa and Candace

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There's two teenage girls in Phineas and Ferb who try their best to bust their loved ones. There's Candace, who tries to bust Phineas and Ferb for their inventions but to no avail. Vanessa does the same to her dad, Dr. Heinz Doofenshmirtz for the latter's 'inators'. What do you think of those girls?