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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.
Assume H0:
In
x2
(
setminus
x0
x1
)
.
Apply unknownprop_e02b92c94ff70655b8eb0623a7ec106c0c0c9c65ac0f52f9689f2e6c9f563b5d with
x0
,
x1
,
x2
,
False
.
The subproof is completed by applying H0.
■