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