| http://www.w3.org/ns/prov#value | - From the values E.sub.1 and E.sub.2, a range of values of normal effort is determined, for example around these values, to within plus or minus 5%, this range in that case being limited by values of E.sub.1 -5% and E.sub.1 +5% or E.sub.2 -5%
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