Apply and3I with
8fca5.. = 8fca5..,
64789.. 5d5d8..,
64789.. a4575.. leaving 3 subgoals.
Let x0 of type (CT2 (CT2 (ι → ι → ι))) → (CT2 (CT2 (ι → ι → ι))) → ο be given.
The subproof is completed by applying H0.
The subproof is completed by applying unknownprop_50153708351b89ea01fe4eeffb39103b18c856cd6a2295bdffe9b6a1af51ccc1.
The subproof is completed by applying unknownprop_ca69d5590f16a82b3262090a8a8e845f4d382952a1b28456e8910491ba455305.