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Cathy adores Philip and also Felix.
Cassandra has a soft spot for Phineas, and Frank.
Finn captures the love of Cassandra, and also Foster.
Cassandra revels in being with Fred and Foster.
Finn is cherished by Candace, and also Foster.
Candy is emotionally attached to both Phineas and Felix.
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Phineas and Ferb Get Busted Wikipedia