Guess the missing item from this list: β-1, α-8, α-0, β-5, β-0, α-1, β-4, α-3, α-2, β-2, α-7, α-5, α-9, β-6, α-6, β-3.
Directly answer with only one item. Item format should match the list format. Provide no explanation. Answer format: "{item}."