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Proofgold Proof

pf
Apply CD_conj_minus with Sing 2, SNo, minus_SNo, λ x0 . x0 leaving 4 subgoals.
The subproof is completed by applying complex_tag_fresh.
The subproof is completed by applying SNo_minus_SNo.
Let x0 of type ι be given.
Assume H0: SNo x0.
The subproof is completed by applying H0.
Let x0 of type ι be given.
Assume H0: SNo x0.
Let x1 of type ι → ι → ο be given.
Assume H1: x1 (minus_SNo x0) (minus_SNo x0).
The subproof is completed by applying H1.
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