| http://www.w3.org/ns/prov#value | - Environmentally hazardous halogenated hydrocarbons represented by the structural formula Cn Hx Cly Fz, wherein n is a whole number from 1 to 2 and x, y and z is equal to 2n+2 can be employed, but, of course, are not preferred in view of their known environmental effects.
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