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pub fn validate_emotion_identity(tone: &str, reem_code: &str) -> bool { match (tone, reem_code) { ("angry", "REEM-A1") => true, ("calm", "REEM-X12") => true, ("joyful", "REEM-J3") => true, ("sad", "REEM-S7") => true, _ => false, // Default to reject unknown pairs } }