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        "http://www.w3.org/ns/prov#value" : [ "A ball 150, shown in cross-section in FIGS. 12 and 12A, made of the same material as the glenoid component 100, or another material such as a biocompatible ceramic, contains a hole 151 of a size so as to produce a light push fit with the stem end 105, an annular groove 152 matching the annular groove 106, a key 153 matching the keyway 107, and an access slot 154." ] ,
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