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Proofgold Proof

pf
Let x0 of type ι be given.
Let x1 of type ι be given.
Let x2 of type ι be given.
Let x3 of type ιο be given.
Assume H0: x3 x0.
Assume H1: x3 x1.
Assume H2: x3 x2.
Let x4 of type ι be given.
Assume H3: x4SetAdjoin (UPair x0 x1) x2.
Apply unknownprop_81da4a4b6c1b1603a521d080942fe6e652095cdddea7d0d491d4c44dcea723fa with x0, x1, x2, x4, x3 leaving 4 subgoals.
The subproof is completed by applying H3.
The subproof is completed by applying H0.
The subproof is completed by applying H1.
The subproof is completed by applying H2.