When such a petition is filed with the Clerk of the Council, the Clerk shall determine the sufficiency thereof in the manner provided in this Charter for an initiative petition for an ordinance. If the petition is found sufficient, the Clerk shall certify that fact to the Council, which shall proceed to reconsider the ordinance. If upon such reconsideration the ordinance is not entirely repealed, the Council shall provide for submitting it to a vote of the electors, and in so doing the Council shall be governed by the provisions of Sections 55 and 64 hereof respecting the time of submission and manner of voting on ordinances proposed to the Council by petition. (Amended 5-7-13)