Let x0 of type ι be given.
Let x1 of type ι → ι → ο be given.
Let x2 of type ι be given.
Apply unknownprop_03ae42654ca1b95c6a7a3055bf66d73476f8afd8ab050f129c58325d8e55fada with
dd3c8.. x0 x1 x2,
x0,
x1,
x2.
Let x3 of type ι → ι → ο be given.
The subproof is completed by applying H0.