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Proofgold Proof

pf
Apply nat_ordsucc_in_ordsucc with 15, 11 leaving 2 subgoals.
The subproof is completed by applying nat_15.
The subproof is completed by applying unknownprop_fa667b0189a0636fab1122d52f50858380b22d14941c9ea2917a7a18d515ca33.