Diário da República, 1.ª série — N.º 18 — 27 de Janeiro de 2009 555force for subsequent equal periods, unless either Party denounces it, in writing and through the diplomatic chan-nels, at least six months before the date of expiry of each period.2 — The denunciation of the present Agreement shall not impair any project or activity initiated within its du-ration.Article 22Revision of the Agreement1 — Either Party may request the other Party, in writing, the revision of this Agreement.2 — The revision shall enter into force under arti-cle 20.Done at Addis Ababa on the 28th of January of two thousand and seven in two original copies, in the English and Portuguese languages, both texts being equally au-thentic. In case of any divergence of interpretation, the English text shall prevail.For the Portuguese Republic:João Gomes Cravinho, State Minister for Foreign Affai-res and Co -operation.For the Federal Democratic Republic of Ethiopia:Mahamoud Dirir Gheddi, ...