The provision in Sam's will which would generally affect how much Mary will receive under Sam's will would be the residuary clause.
In a will there is a residuary clause which sets out who will inherit the remainder of the deceased’s assets once any debts, inheritance tax, funeral expenses, and legacies have been paid, and any items specifically passed on have been distributed to the appropriate beneficiaries.
So in this case, after Sam his daughter Mary will be given bulk of his estate. In Sam's will there is a provision which would generally affect how much Mary will receive, which is under the residuary clause.
Hence, according to this clause certain expenses are to be paid which would be deducted from the specific amount written in the will.
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