| fh = mkfh(fid0, mode, m), fid = fid0 ∨ n ∈ ofh ∧ ofh[n].fid = fid ⊦ fd ∈ ofh, ∃ n. n ∈ ofh[fd, fh] ∧ ofh[fd, fh][n].fid = fid |
fid = fid0 ∨ n ∈ ofh ∧ ofh[n].fid = fid ⊦ fd ∈ ofh, ∃ n. n ∈ ofh[fd, mkfh(fid0, mode, m)] ∧ ofh[fd, mkfh(fid0, mode, m)][n].fid = fid