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Gregorian Chant: Antiphona ad Introitum. 1. First Sunday of Advent. 2. Christmas Midnight Mass. 3. Palm Sunday. 4. Easter Sunday Mass. 5. Pentecost Day. 6. Ember Saturday after Pentecost / Pentecost Vigil. 7. 18th Sunday after Pentecost / 24th Sunday of the Year.
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