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- Septuagesima ferias are IV class (per annum), not III class, so a III
class saint (e.g. Conversion of St Paul, Jan 25) displaces them.
- Holy Week ferias and the privileged octaves of Easter and Pentecost are
I class: no saint's feast is admitted (temporal office wins).
- Occurrence tie-break is asymmetric by season: an ordinary feria (Advent,
per annum) yields to an equal-class feast; Lent/Passiontide ferias keep
their privilege and win the tie.
- A II class feast of the Lord (Purification, Exaltation of the Cross,
Dedication of the Lateran) displaces a II class Sunday it falls on.
Validated against missalemeum across 2025-2027: ~97.5% of days observe the
liturgically-correct celebration, 100% rank agreement on saint-days.
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