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Proofgold Proof
pf
Let x0 of type
ι
be given.
Assume H0:
x0
∈
u6
.
Let x1 of type
ι
be given.
Assume H1:
x1
∈
u6
.
Apply orIL with
u1
∈
u2
,
and
(
u1
=
u2
)
(
x0
∈
x1
)
.
The subproof is completed by applying In_1_2.
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