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