Let x0 of type ι be given.
Let x1 of type ι be given.
Let x2 of type ι be given.
Apply set_ext with
x1,
x2 leaving 2 subgoals.
Apply unknownprop_19e8e894717f90e381ffc2559918b0df77d13add26f4c4f5e095d4b27dec0a49 with
x0,
x1,
x2 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.
Apply unknownprop_19e8e894717f90e381ffc2559918b0df77d13add26f4c4f5e095d4b27dec0a49 with
x0,
x2,
x1 leaving 4 subgoals.
The subproof is completed by applying H1.
The subproof is completed by applying H0.
The subproof is completed by applying H3.
The subproof is completed by applying H2.