(f)measuresbyCanadarespectingtheimportationanddistributionofimportedliquorbydesignatedgovernmentagenciesundertheexistingprovisionsofImportationofIntoxicatingLiquorsAct,R.S.C.1985,c.I-3,asamended,totheextentthatitcreatesanimportmonopolyconsistentwithA (g)exceptasprovidedinChapterSeven(Agriculture),measuresbyCanadarespectingpreferentialfreightratesforgrainoriginatingincertainCanadianprovincesundertheexistingprovisionsofWesternGrainTransportationAct,R.S.C.1985,c.W-8,asamended;