| http://www.w3.org/ns/prov#value | - the T1, and wherein T2 is selected from the group consisting of the units HO1/2, R1O1/2 and (R2)3SiO1/2; wherein m, n, p, q, r, s and t each represent integers or fractional numbers which meet the following cumulative conditions: m and t are other than zero and their total is equal to 2+s; n, p, q and r lie within the range from 0 to 100; s lies within the range from 0 to 75; when n=0, p is other
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