[ Formula structure ]
The public formula describes structure.
- CBB = min birth year where CLL_y >= DOF_y
- Private calibration, weighting, and evidence ranking stay protected.
[ How to read it ]
The metric supports screening, not certification.
- A later CBB suggests direct object familiarity persists for more cohorts.
- An earlier CBB suggests the symbol depends on learned convention for many users.
- Every reading depends on declared context and evidence quality.
- Human validation remains first-order evidence.