| http://www.w3.org/ns/prov#value | - Examples of bridge members Y.sub.1 are alkylene radicals, such as C.sub.2 -C.sub.6 -alkylene, optionally interrupted by O, S or N and optionally substituted, for example ethylene, 1,2- and 1,3-propylene, 1,2-, 1,3-, 1,4- and 2,3-butylene,
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