| http://www.w3.org/ns/prov#value | - The most preferred ones include; an alkenylene group having 1 to 3 carbon atoms such as methylene group, methylmethylene group (ethylidene group), ethylene group, ethylmethylene group (propylidene group), dimethylmethylene group (isopropylidene group), methylethylene group (propylene group), trimethylene group and the like; an alkenylene group having 2 to 3 carbon atoms such as vinylidene group, e
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