 While retaining the semidouble rite for Sundays, the reform permitted only the most important feast days to be celebrated on Sunday, although commemorations were still made until the reform of 1960.The division into doubles (of various kinds), semidoubles, and simples continued until 1955, when Pope Pius XII abolished the rank of semidouble, making all the previous semidoubles simples, and reducing the previous simples to a mere commemoration in the Mass of another feast day or of the feria on which they fell.Then, in 1960, Pope John XXIII completely ended the ranking of feast days by doubles etc., replacing it by a ranking, applied not only to feast days but to all liturgical days, as I, II, III, and IV class days.