exchang letter combin nomenclatur letter commun sir negoti led sign agreement european econom commun polish peopl republ trade commerci econom cooper agre identif classif product cover annex agreement base combin nomenclatur deriv harmon commod descript code system identif classif contain initial annex base nomenclatur common custom tariff nomenclatur good extern trade statist commun statist trade member state nimex exist decemb modifi commun order compli provis paragraph modif effect pursuant paragraph lead signific chang extent liber accord pursuant articl oblig confirm agreement term letter accept sir assur highest consider behalf council european commun letter poland sir honour acknowledg receipt letter todai date read negoti led sign agreement european econom commun polish peopl republ trade commerci econom cooper agre identif classif product cover annex agreement base combin nomenclatur deriv harmon commod descript code system identif classif cointain initial annex base nomenclatur common custom tariff nomenclatur good extern trade statist commun statist trade member state nimex exist decemb modifi commun order compli provis paragraph modif effect pursuant paragraph lead signific chang extent liber accord pursuant articl oblig confirm agreement term letter honour confirm govern agreement content letter accept sir assur highest consider govern polish peopl republ