| http://www.w3.org/ns/prov#value | - This is not showing a trend, or lack of trend, this is showing a lack of good data. (Any earlier again, and we are looking at Middle English, and while the ending of smoothe/smothe/smethe may have had an effect on the existence of the form smoothe, it is clearly meaningless in terms of the sort of comparison we are doing here).
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