4. Section 3 of the principal enactment is hereby amended as follows :
(1) in paragraph (iii) of that section, by the substitution, for the words and figures " relevant year commencing on April 1, 1991 ; and ", of the words and figures " relevant year commencing on April 1, 1991;" ; |
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(2) in paragraph (iv) of that section, by the substitution, for the words and figures " relevant year commencing on April 1, 1992.", of the words and figures " relevant year commencing on April 1,1992; and "; |
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(3) by the addition, immediately after paragraph (iv) of that section, of the following paragraph :
| | "(v)
| | | (a) not less than fifty per centum, on or before August 15, 1993 ; and |
| (b) the balance on or before November 15, 1993. |
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