Let x0 of type ι be given.
Apply unknownprop_b1688df6c44ba77d79de73f8f342bb066cd3f42d8bb655e89687f3927126b720 with
λ x1 x2 : ι → ι → ο . not (x2 x0 x0).
The subproof is completed by applying unknownprop_89856b2bb172b7e45b2bae233fcf9ec79e177cd99c96d2311c7987a03dd8aaca with
SNoLev x0,
λ x1 . In x1 x0.