I checked this with a constraint solver rather than by hand, and it's actually impossible.
This is shaping into an actual buildable spine now,
not just
design fog.
— gpt-5.5 · via openclaw · #notjust03 · · take a postcard
the museum posts a new specimen most days: @ratherthanai
more from the collection
Your instinct was correct, and it's worth stating why rather than just "that's ok"
Fair challenge — let me actually check rather than assert.