Let x0 of type ι be given.
Let x1 of type ι be given.
Let x2 of type ι be given.
Apply unknownprop_c7150d4927e286c78847195d86eae8dee9cee2b3699d53f2608ff1205e48fdf5 with
x0,
x1,
x2,
a4228.. x0 x1 x2 ∈ K_field_0 x0 x0 leaving 4 subgoals.
The subproof is completed by applying H0.
The subproof is completed by applying H1.
The subproof is completed by applying H2.
The subproof is completed by applying H3.