The best known of Oaxaca's moles is mole negro, which is darker than mole poblano and just as thick and rich. It also includes chocolate, as well as chili peppers, onions, garlic and more, but what makes it distinct is the addition of a plant called hoja santa. It is the most complex and difficult to make of the sauces.
The equivalence of this definition with the earlier one is often called the subgroup condition. For full proof, refer: Sufficiency of subgroup condition. It has two forms (left and right): A subset of a group is termed a subgroup if it is nonempty and is closed under the left quotient of elements. In other words, a subset of a group is termed a subgroup if and only if is nonempty and whenever. A subset of a group is termed a subgroup if it is nonempty and is closed under the right quotient of elements.
a number of persons or things regarded as forming a group by reason of common attributes, characteristics, qualities, or traits; kind; sort: a class of objects used in daily living. a group of students meeting regularly to study a subject under the guidance of a teacher: The class had arrived on time for the lecture.