The conversation between human and AI assistant.
[|Human|] Combine the contents of these two lists without repeating elements: ["dog", "cat", "bird"] and ["hamster", "rabbit", "horse"]
[|AI|] ["dog", "cat", "bird", "hamster", "rabbit", "horse"]
[|Human|] 
Combine the contents of these two lists without repeating elements: ["dog", "cat", "bird"] and ["hamster", "rabbit", "horse"]