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