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1In this Schedule:—
" the amount chargeable " means the amount referred to in section 29(3) of this Act, and
" the relevant period "—
where the amount chargeable arose under section 22 of this Act, means the period treated in computing that amount as being the duration of the lease ;
where that amount arose under section 23 of this Act, means the period treated in computing the amount as being the duration of the lease remaining at the date of the assignment;
where that amount arose under section 24 of this Act, means the period beginning with the sale and ending on the date fixed under the terms of the sale as the date of the reconveyance or grant, or, if that date is not fixed, ending with the earliest date at which the reconveyance or grant could take place in accordance with the terms of the sale.