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Three rules, in priority order: the Annunciation in Holy Week goes to
Easter+8; any other solemnity on a Sunday of Advent, Lent or Easter goes to
the following Monday (n. 5, which n. 60 defers to explicitly), except on Palm
Sunday or Easter Sunday; otherwise the nearest later day free of Tabula
entries 1-8.
The n. 5 Monday rule is easy to miss -- n. 60 names it only by cross
reference, and reading n. 60 alone yields a single search rule where the
sources give three.
Shaped to match Rite.t.transfer_target so a later phase wires it unchanged,
with its own step bound: Calendar's round guard bounds rounds, not one call's
internal search.
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The prior comment claimed of-nativity-vigil is 'not a distinct celebration' -
wrong: Temporal_of.named (temporal_of.ml:230) constructs it as its own
Sollemnitas-rank candidate on 24 December, a genuine contestant in
band/Precedence.resolve.
The real reason None is safe is structural, not that. The Nativity is
Tabula entry 2 (band 20); only entry 1, the Paschal Triduum (band 10),
bands lower. The Triduum's Easter-2..Easter window is confined to 20
March-25 April because Gregorian Easter never falls outside [22 March, 25
April] over the whole 1583-9999 domain (measured exhaustively in
test_computus.ml, not assumed), so it can never reach 25 December. The
Nativity therefore always keeps its own day and its vigil can never be
orphaned by a transfer or reduction.
Behaviour is unchanged: vigil_feast still returns None unconditionally.
RG 33 (EF-only) and Normae nn. 11/13 remain the reason the hook exists at
all and returns None for every other candidate.
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admit returns the empty list because disposition never returns Commemorate;
vigil_feast returns None because the OF has no vigil office that its feast's
movement could orphan -- 'of-nativity-vigil' is a Mass formulary of the
solemnity, not a separate celebration.
Both are argued from the sources rather than stubbed, and Precedence_of.rules
now assembles the four functions the kernel resolver consumes.
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An impeded solemnity transfers; every other loser is omitted for that year
('Reliquae celebrationes eo anno omittuntur').
Commemorate is never returned, and that is the rule rather than a gap: the OF
has no commemoration of a losing celebration in the EF's sense, and an
optional memorial is an election rather than a commemoration. A property over
every rank pairing asserts it, so a later edit cannot quietly introduce one.
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Entries 10-13. Entry 12 is one undivided row -- the Tabula draws no
universal/proper split for optional memorials, unlike entries 3/4, 7/8 and
10/11 -- so it deliberately does not read the layer.
Entry 13's four clauses need no date arithmetic of their own: every
privileged feria is entries 2 and 9, tested earlier in the chain, so what
reaches the final branch is exactly the residue those clauses name.
Entry 10 uses [not (is_proper layer)], not the brief's original
[is_universal layer]: is_universal was deleted as dead code in Task 2,
because every temporal-origin candidate carries layer = "temporal", never
universal_layer, so a positive is_universal test can never match one --
the same correction entries 3, 5 and 7 already apply.
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Entries 5-9. Entries 5 and 7 differ only by subject -- 'Festa Domini'
against 'Festa beatae Mariae Virginis et Sanctorum' -- so they key on
Celebration.t.subject, the same field RG 91 entry 14 uses on the EF
side, never on the slug.
Entry 9's three clauses (late-Advent ferias from 17 December, the
Nativity octave, Lenten ferias) are what separates a privileged feria
from the ordinary one at entry 13.
CORRECTION to the task brief, applied here rather than after: entries
3, 5 and 7 test 'not (is_proper layer)', not 'is_universal layer'.
Every temporal-origin candidate Temporal_of.temporal constructs
carries layer = "temporal" unconditionally, never universal_layer, so
a positive universal-layer test silently excluded every temporal-cycle
solemnity and Lord-subject feast from these entries -- Corpus Christi
came out unclassified outright, and Trinity/Christ the King/Holy
Family/the Baptism of the Lord landed one entry too low. is_universal
is now dead and removed; entry 3's branch (written in Task 1) is
amended along with the new entries 5 and 7. Only entries 4 and 8 still
test is_proper directly, matching the Tabula's own proper-calendar
rows.
Also fixes a pre-existing typo in the brief's own 'entry 6: a Sunday
per annum' test row: rank was Sollemnitas, which -- being tested at
entry 3, earlier in the chain -- made the row fail regardless of the
is_universal/is_proper question, since no real Sunday per annum is
ever Sollemnitas. Changed to Festum, matching the adjacent 'Sunday of
Christmas time' row and real Temporal_of output.
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The Tabula dierum liturgicorum's entries 1-4, one band branch each, scaled
x10 as Precedence_ef's own table is. The Triduum is identified structurally
by Easter offset because Temporal_of emits Good Friday and Holy Saturday as
ordinary Lent week-6 ferias, leaving no slug to key on.
Holy Thursday sits at entry 2, not entry 1: the Tabula's own entry 2 runs
'a feria II ad feriam V inclusive' and the Triduum opens with an evening
Mass inside that civil day. Same granularity decision the litcal layer's L1
records on the season axis.
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