Let x0 of type ι be given.
Apply unknownprop_ea78574cb3264467ecb0cee6dab0f2cbbdf0e0a00f843238d57e1be6acdbe25f with
d3786.. 4a7ef.. x0.
The subproof is completed by applying unknownprop_8f5bf12cfaed0ffd6b0b2703f40521e4f47dbe14ca71e17ebdcebdd96c630d67 with
4a7ef..,
x0.