NSSet result = ERXUtilities.setFromArray(main); return result.setBySubtractingSet(ERXUtilities.setFromArray(minus)).allObjects();
NSSet result = ERXArrayUtilities.setFromArray(main); return result.setBySubtractingSet(ERXArrayUtilities.setFromArray(minus)).allObjects();
    public static NSArray arrayMinusArray(NSArray main, NSArray minus){        NSSet result = ERXUtilities.setFromArray(main);        return result.setBySubtractingSet(ERXUtilities.setFromArray(minus)).allObjects();    }