 The second is the Circular Letter of the Sacred Congregation for the Clergy of 30 October 1970, "Per Instructionem" on the reform of choir dress, which applied the prescriptions of "USS" to canons, beneficiaries, pastors, and, by explicit extension, all other ecclesiastical ranks.Neither of these documents provided synthetic schemata of the forms of dress of all secular and religious clergy of the Latin Rite, but rather amended the preexisting paradigms.A more systematic list of the forms of dress, that relied on these two previous documents and partially augmented them, was provided by the first appendix of "Caeremoniale Episcoporum" ("CE") on the dress of prelates.