where an element of the international application referred to in article 11(a) or (e) or a part of the description, claims of drawings referred to in rule 20 (a) is not otherwise contained in this international application but is completely contained in an earlier application whose priority is claimed on the date on which one or more elements referred to in article 11(1) were first received by the receiving Office, that element or part is, subject to confirmation under rule 20, incorporated by reference in this international application for the purpose of rule 20