5. The rate of the excise tax on any taxable article may, having regard to the class or description of that article, be determined by reference to-
(a) the value of that article, or of any particular weight, quantity, or amount of that article; or |
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(b) any particular weight, quantity, or amount of that article, |
| and accordingly different rates of such tax may be determined in respect of different classes or descriptions of taxable articles. |