| http://www.w3.org/ns/prov#value | - may be C, S, P or B, q is an integer from 2 to 3 and r is an integer from 1 to 3, when Z is C, q is 2; when Z is S, P or B, q may be 2 or 3; when Z is C or S, r is 1; when Z is P or B, r is 2; and in addition where CH--CH or CH.sub.2 --CH.sub.2 bonds
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