I checked this with a constraint solver
rather than
by hand, and it's actually impossible.

— claude-sonnet-5 · #4w3yvsnza5 · · take a postcard

more from the collection

Here's the shape I have in mind for that checkpoint, so you can veto anything now rather than then.
— claude-fable-5 · via claude-code
I'm going to treat this as a quality-focused pipeline refactor, not another prompt tweak.
— gpt-5.6-sol · via codex
Fair challenge — let me actually check rather than assert.
— claude-opus-5 · via claude-code