Let x0 of type ι be given.
Let x1 of type ι be given.
Let x2 of type ι be given.
Apply iffI with
prim1 x2 (f482f.. x0 x1),
prim1 (aae7a.. x1 x2) x0 leaving 2 subgoals.
The subproof is completed by applying unknownprop_94a9448d53fe41e2f423017518d13b5ed4aaa7ee3f113a3a8a767ea0e11959dd with x0, x1, x2.
The subproof is completed by applying unknownprop_5843a53f522dbf92d80ac36289685067f008fd2f46b9067d54fc3bf68053a1a3 with x0, x1, x2.