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Proofgold Proof

pf
Apply add_nat_SR with 6, 2, λ x0 x1 . x1 = 9 leaving 2 subgoals.
The subproof is completed by applying nat_2.
set y0 to be ordsucc (add_nat 6 2)
set y1 to be 9
Claim L0: ∀ x2 : ι → ο . x2 y1x2 y0
Let x2 of type ιο be given.
Assume H0: x2 9.
set y3 to be λ x3 . x2
Apply unknownprop_322d60e409d28f2933376ad9b03426ecbf00d5aadf0d49b69462c8faf31aa96a with λ x4 x5 . y3 (ordsucc x4) (ordsucc x5).
The subproof is completed by applying H0.
Let x2 of type ιιο be given.
Apply L0 with λ x3 . x2 x3 y1x2 y1 x3.
Assume H1: x2 y1 y1.
The subproof is completed by applying H1.