| http://www.w3.org/ns/prov#value | - The demand for cerium (Ce), for example, has almost nothing whatsoever to do with the demand for lanthanum (La), or any other REE. They are not interchangeable, nor substitutable for each other, except in very few cases such as that of neodymium (Nd) and praseodymium (Pr), which in some limited applications in rare-earth permanent magnets (REPMs), are substitutable/interchangeable.
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