21.—If the Board pay off any moneys borrowed by them under this Part of this Act otherwise than by instalments or by means of a Sinking Fund they may from time to time reborrow the same but all moneys so reborrowed shall be repaid within the hereinbefore prescribed period and shall be deemed to form the same loan as the moneys originally borrowed and the obligations of the Board with respect to the repayment of the loan and to the provision to be made for such repayment shall not be diminished by reason of such reborrowing.
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