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