Time limitations

(1) Except as otherwise provided elsewhere in this Code, no court, shall take cognizance of an offence of the category specified in sub-section (2), after the expiry of the period of limitation.

(2) The period of limitation shall be-

(a) Six months, if the offence is punishable with fine only;

(b) One year, if the offence is punishable with imprisonment for a term not exceeding one year;

(c) Three years, if the offence is punishable with imprisonment for a term exceeding one year but not exceeding three years.

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DP 3 says

1) If any person, after the commencement of this Act, gives or takes or abets the giving or taking of dowry, he shall be punishable with imprisonment for a term which shall not be less than five years, and with the fine which shall not be less than fifteen thousand rupees or the amount of the value of such dowry, whichever is more:

Provided that the Court may, for adequate and special reasons to be recorded in the judgment, impose a sentence of imprisonment for a term of less than five years.

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So DP3 can not be  removed being upto 5 years.

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DP4 says

 4. Penalty for demanding dowry.- If any person demands directly or indirectly, from the parents or other relatives or guardian of a bride or bridegroom as the case may be, any dowry, he shall be punishable with imprisonment for a term which shall not be less than six months but which may extend to two years and with fine which may extend to ten thousand rupees:

Provided that the Court may, for adequate and special reasons to be mentioned in the judgment, impose a sentence of imprisonment for a term of less than six months.

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DP4 cancellation is also not possible , Becasue she will state recent within one year statements.

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Any other sections.