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(a) has been used by that person for the purposes of a trade carried on by that person and, in relation to machinery or plant provided for use for the purposes of a trade on or after the 1st day of April, 1990, while so used, was used wholly and exclusively for those purposes, and
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then, in determining the amount of the allowance or, as the case may be, the amount on which the charge is to be made, regard shall be had to all the relevant circumstances and in particular to the extent of the use for those other purposes, and there shall be made to or on that person an allowance of such an amount or a charge on such an amount, as the case may be, as may be just and reasonable.
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