Combine the contents of these two lists without repeating elements: ["dog", "cat", "bird"] and ["hamster", "rabbit", "horse"]
["dog", "cat", "bird"], ["hamster", "rabbit", "horse"]
["dog", "cat", "bird", "hamster", "rabbit", "horse"]
Complete the following task based on the instruction and optional input provided.### Instruction:
Combine the contents of these two lists without repeating elements: ["dog", "cat", "bird"] and ["hamster", "rabbit", "horse"]

### Input:
["dog", "cat", "bird"], ["hamster", "rabbit", "horse"]

### Output:
["dog", "cat", "bird", "hamster", "rabbit", "horse"]