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