To correspond to the new psalms, the antiphonary of the traditional Roman Office was also almost completely overhauled as well. Pre-1911, there were 141 unique antiphons in the psalter. Post-1911, there were 220. Only 66 antiphons were recognizably the same, and some 16 of these added words or removed them. Many of the overlapping ones were those for the special seasons (Advent, Lent, Passiontide), not for the "per annum" ferias. Thus 75 antiphons of the pre-1911 Breviary were removed, and 154 unique to the post-1911 Breviary introduced.