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Proofgold Proof
pf
Apply pair_tuple_fun with
λ x0 x1 :
ι →
ι → ι
.
∀ x2 x3 x4 .
x4
∈
x2
⟶
x0
0
x4
∈
x0
x2
x3
.
The subproof is completed by applying pairI0.
■