import org.jscience.physics.amount.Amount;
import com.billkuker.rocketry.motorsim.Validating;
-import com.billkuker.rocketry.motorsim.Validating.ValidationException;
import com.billkuker.rocketry.motorsim.grain.util.BurningShape;
import com.billkuker.rocketry.motorsim.grain.util.RotatedShapeGrain;