sentences:  Classification societies may sometimes use somewhat different distinguishing marks for Finnish-Swedish ice classes; for example, 1A Super is defined as "Ice Class I AA" by the American Bureau of Shipping (ABS) and "ICE(1A*)" by DNV GL.The American Bureau of Shipping has a system of ice classes which includes classes A5 through A0; B0, C0, and D0.A5 class is the strongest built of the classes, with D0 being the weakest.