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Here's the requested content in spun format
with synonyms:
Cathy is crazy about Fred and Felix.
Cara has deep affection for Phineas, and Foster.
Finn has won the affection of Cathy, and Foster.
Candy takes delight in being with Fred
and Frank.
Fred Candace, and also Felix.
Cassandra shares a bond with both Philip and Ferb.
I hope you find these variations helpful!