Not wholly produced or obtained: products with limited non-originating content may qualify for preferential treatment if final manufacture occurs domestically. Products qualify for preferential origin when non originating materials do not exceed fifty per cent of the f.o.b. value and final manufacture occurs in the exporting Contracting Party; sufficient processing may be shown by a change of four digit Harmonised System heading, while specified simple operations (preservation, cleaning, simple packing, labelling, simple mixing or assembly, slaughter) are deemed insufficient; non originating inputs are valued at c.i.f. import value or the earliest ascertainable domestic price.