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