 Instead it laid down that the Sundays of Advent and Lent and those that follow up to Low Sunday, and also Pentecost Sunday, are celebrated as doubles of the first class, and outrank all feasts; but when feasts of the first class occur on the second, third or fourth Sunday of Advent, Masses of the Feast are permitted.Sundays previously celebrated in the semi-double rite were raised to the double rite.A feast of our Lord occurring on a Sunday "per annum" was to take the place of the Sunday.