Versions of s. 127(9), definition “qualified canadian exploration expenditure”, para (f)

the total of all amounts each of which is an amount deducted under subsection 127(5) from the tax otherwise payable under this Part by the taxpayer for a preceding taxation year in respect of property acquired, or an expenditure incurred, in the year or in any of the 10 taxation years immediately preceding or the 2 taxation years immediately following the year, or in respect of the taxpayer’s SR&ED qualified expenditure pool at the end of such a year,