Apply unknownprop_4c4b27a97d7f3e81d4abb7629b850d6c55c186f55f30e3dfae132a3ddf1e0a30 with
4ae4a.. (4ae4a.. (4ae4a.. (4ae4a.. 4a7ef..))),
4a7ef...
The subproof is completed by applying unknownprop_a783e05b0fd604cd94052e7258e0b97c878d4243b7d2b6dcf78ec7a55a7b39af.