b) for high strength and extra high strength steels, approval testingof any higher toughness grade also covers approval for all lowertoughness grades in the same strength level as well as similartoughness grade and all lower toughness grades in one strength levelimmediately below under the same approval conditions. Example:Approval of grade VL E36 may cover the grades VL D36, VL A36 aswell as VL E32, VL D32 and VL A32. See Table 2