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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:
Subq
x0
x1
.
Assume H1:
nIn
x2
x1
.
Assume H2:
prim1
x2
x0
.
Apply H1.
Apply H0 with
x2
.
The subproof is completed by applying H2.
■