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