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Candace adores Phineas and also Felix.
Cathy Phineas, and also Ferb.
Philip Candace, and Ferb.
Cathy being with Fred and Foster.
Phineas Cara, and also Felix.
Cathy has a deep connection with both Fred and Ferb.
I hope you find these variations helpful!
Phineas and Ferb Get Busted