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