Same Carbon-500M next-token distribution as Widget 03. Fix a base under any position and the open positions
re-marginalize over only the six-mers consistent with your choices; a fixed position freezes at its current
distribution, and the grid below greys out the six-mers that are no longer reachable.
Per-position base distribution · fix a base and the rest re-condition
All six-mers, ranked by probability ·