| http://www.w3.org/ns/prov#value | - ne used in forming the catalytic complex; X is a group other than a leaving group that is bonded to the d- or f-block metal atom and that does not detrimentally affect propagation of a polymer chain during polymerization; a is 0 or 1; b is a whole integer from 1 to 3; c is 1 to 3; d is 0 or 1; and the sum of c and d is at least 2.
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