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