C.2.2a:4.6 - Non-substitution of F

F remains one basis slot in the chart, not the whole chart.

A conforming account shall not infer:

• closure from formality alone;
• anchoring from publication-face format alone;
• representation factors from articulation alone;
• or routing admissibility from a lone F statement.

Where operationally meaningful thresholds exist, they must be published on the relevant slots rather than being disguised as informal F sublevels.