| http://www.w3.org/ns/prov#value | - and suitably contains 0.01 to 100 g, especially 0.1 to 20 for example 0.1 to 2.0 g, of seed zeolite per 100 g of SiO.sub.2. (Note that the H.sub.2 O/(OH).sub.2.sup.-- ratio given in the provisional specification was by inadvertent error too low
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