| http://www.w3.org/ns/prov#value | - nding the located impurity said central area of the impurity to determine whether the impurity is a gel or an impurity of some type other than a gel, wherein said gel is an impurity in the transparent material having a central part with greater light transparency than surrounding parts and said impurity of a type other than a gel is an impurity in the transparent material having a central part wit
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