Ordinances and other measures may be proposed by initiative petition and adopted by election by the electorate, to the extent and in the manner now or hereafter provided by the Constitution and laws of the State of Ohio. If two (2) or more petitions of the same subject or two (2) or more petitions conflict with each other, the one receiving the greater vote shall be adopted. Any ordinance so adopted shall not be subject to repeal by Council for a period of five (5) years.