a good book on relations in discrete mathematics

Question

I am self-studying discrete mathematics and I have troubles in solving the exercises that are included at the end of the chapter in my book. The book that I'm reading is already a good one, but it includes only a few examples and also, it lacks a "Solution to the selected exercises" appendix. The exercises at the end of the chapters are so difficult and unfamiliar to me that I'm only able to solve a few of them. I need a book on the topic of relations and functions, with lots of examples solved, or at least, a book that have the solution to some of the exercises as an appendix. Could you please suggest a book? It does not matter if it is not completely dedicated to the subject. The book I am reading now include topics such as graph and matrix of relations, properties of relations, equivalence relations, operations on relations, combining relations, closures (symmetric, transitive, reflexive), and the like.