To get the free dessert, one must order an entree and a salad  But anyone who orders either an entree or a salad can receive a free soft drink
Thus, anyone who is not eligible for a free soft drink is not eligible for a free dessert
To get an executive position at Teltech, one needs a university diploma and sales experience. But anyone who has worked at Teltech for more than six months who does not have sales experience has a university diploma. Thus, one cannot get an executive position at Teltech unless one has worked there for six months.