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Is this chip compatible with a T640 printer which is marked Region 4?Background:The printer came with a cartridge 64015HA P/N 43H0168 High Yield. It worked.With the printer came a replacement cartridge in original Lexmark packaging 64018SL P/N 43H0168. It also worked.We bought a cartridge (Lexmark unopened package) 64015SA P/N 43H0168 and got a an error message 42.21 Can your chip resolve this incompaibility?