| http://www.w3.org/ns/prov#value | - Carbon and/or a carbon compound means e.g., graphite (graphite contains so-called HOPG, PG, or GC; HOPG is an almost perfect graphite crystal structure, and PG is a slightly disordered crystal structure having crystalline grains of about 20 nm, while GC contains crystal grains having a size as small as 2 nm and has a crystal structure that is remarkably in disarray) or non-crystalline carbon (non-
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