(2) No bill passed by either House shall become a law unless it has passed three readings on separate days, and printed copies thereof in its final form have been distributed to its Members three days before its passage, except when the President certifies to the necessity of its immediate enactment to meet a public calamity or emergency. Upon the last reading of a bill, no amendment thereto shall be allowed, and the vote thereon shall be taken immediately thereafter, and the yeas and nays entered in the Journal. Section 27. (1) Every bill passed by the Congress shall, before it becomes a law, be presented to the President. If he approves the same he shall sign it; otherwise, he shall veto it and return the same with his objections to the House where it originated, which shall enter the objections at large in its Journal and proceed to reconsider it. If, after such reconsideration, two-thirds of all the Members of such House shall agree to pass the bill, it shall be sent, together with the objections, to the other House by which it shall likewise be reconsidered, and if approved by two-thirds of all the Members of that House, it shall become a law. In all such cases, the votes of each House shall be determined by yeas or nays, and the names of the Members voting for or against shall be entered in its Journal. The President shall communicate his veto of any bill to the House where it originated within thirty days after the date of receipt thereof, otherwise, it shall become a law as if he had signed it. (2) The President shall have the power to veto any particular item or items in an appropriation, revenue, or tariff bill, but the veto shall not affect the item or items to which he does not object. Section 28. (1) The rule of taxation shall be uniform and equitable. The Congress shall evolve a progressive system of taxation. (2) The Congress may, by law, authorize the President to fix within specified limits, and subject to such limitations and restrictions as it may impose, tariff rates, import and export quotas, tonnage and wharfage dues, and other duties or imposts within the framework of the national development program of the Government. (3) Charitable institutions, churches and personages or convents appurtenant thereto, mosques, non-profit cemeteries, and all lands, buildings, and improvements, actually, directly, and exclusively used for religious, charitable, or educational purposes shall be exempt from taxation. (4) No law granting any tax exemption shall be passed without the concurrence of a majority of all the Members of the Congress. Section 29. (1) No money shall be paid out of the Treasury except in pursuance of an appropriation made by law. (2) No public money or property shall be appropriated, applied, paid, or employed, directly or indirectly, for the use, benefit, or support of any sect, church, denomination, sectarian institution, or system of religion, or of any priest, preacher, minister, other religious teacher, or dignitary as such, except when such priest, preacher, minister, or