The membrane for N = 91 is a word of nested ∈…∋ frames, one per de-interlace level. The reversal ≺ clears the live register, so a count left in the open is lost, while a count banked in an enclosing frame survives and the fuse ∋ restores it. Fire the three clears and watch what survives.
Measured in the kernel: the one-level word ⊢∈⊥⊤⊥⊥⊞⊥⊥⊤≺∋⊡⊣ deposits 8, clears 9 and restores 9. Same-wound closure: ⊢ opens wound κ, ⊣ closes it, and ⊡ marks the local fixed point at the top. Nothing is written outside κ.