4. Section 3 of the principal enactment is hereby amended as follows:-
(1) in paragraph (i) of that section, by the substitution, for the words and figures relevant .year commencing on April 1, 1989, and", of the words and figures "relevant year commencing on April 1, 1989"; |
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(2) in paragraph (ii) of that section, by the substitution, for the words and figures "relevant year commencing on April 1, 1990.", of the words and figures "relevant year commencing on April 1, 1990, and" ; and |
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(3) by the addition, immediately after paragraph (ii) of that section, of the following paragraph : "
| | (iii)
| | | (a) not less than fifty per centum, on or before August 15, 1991; and |
| (b) the balance, on or before November 15, 1991, |
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