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