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