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Candace Phineas and also Frank.
Cassandra has deep affection for Finn, and Frank.
Finn holds a special place in the heart of Candace, and also Foster.
Cara finds joy in being with Fred and Frank.
Philip has a special place in the heart of Cassandra, and also Frank.
Candace has a deep connection with both Philip and Felix.
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Phineas and Ferb Get Busted Wikipedia