| http://www.w3.org/ns/prov#value | - wherein M1, M2 and M3 represent Na, K or H; M4 and M5 represent Ca or Mg; p, q and r represent a number of 0 to 2, provided that p + q + r = 2; s and t represent a number of 0 to 1, provided that s + t = 1; x is a number of 0 to 1 and y is a number of 0.9 to 3.5. 2.
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