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