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