sentences:  Originally designed for college-level students as a supplement to standard course textbooks, each chapter of a typical Outline begins with only a terse explanation of relevant topics, followed by many fully worked examples to illustrate common problem-solving techniques, and ends with a set of further exercises where usually only brief answers are given and not full solutions.Despite being marketed as a supplement, several titles have become widely used as primary textbooks for courses (the "Discrete Mathematics" and "Statistics" titles are examples).This is particularly true in settings where an important factor in the selection of a text is the price, such as in community colleges.