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Proofgold Proof

pf
Let x0 of type ι be given.
Let x1 of type ι be given.
Assume H0: Subq x0 x1.
Apply set_ext with d3786.. x0 x1, x0 leaving 2 subgoals.
The subproof is completed by applying unknownprop_8f5bf12cfaed0ffd6b0b2703f40521e4f47dbe14ca71e17ebdcebdd96c630d67 with x0, x1.
Let x2 of type ι be given.
Assume H1: prim1 x2 x0.
Apply unknownprop_0eb2245dc687a56a5adef9ad3fc675715803356fcfbd14168f93f22b67fac4c1 with x0, x1, x2 leaving 2 subgoals.
The subproof is completed by applying H1.
Apply H0 with x2.
The subproof is completed by applying H1.