[MUSIC] In previous videos, we looked at different ways to select interesting, relevant concepts in a large concept lattice. But there are other approaches to making diagrams better readable. I'll very briefly mention one of them, nested line diagrams. So here, the idea is that we split the attribute sets into two or maybe three, or four parts. And sometimes it's quite natural to split the attribute set into several parts. Then we compute the concept lattice for each resultant sub concept individually. So we get two lattices. And then we put one lattice inside each node of the other lattice. Or get something like this. So here, we have split the attributes into two parts. Those related to education, so you might have at least high school education or at least college education, or at least incomplete higher education or at least, higher education. So we have four gradations of education. So the concept lattice corresponding to these four attributes is just a straight line. Because if your level of education is say, at least incomplete higher education, then it's certainly at least high school. So to enter university, you had to finish high school. And then we also have attributes related to employment. Employed, unemployed, and every person is employed that hence, you can deploy in commerce, in construction and education, in medicine, in the industry. If the person is unemployed, he or she may be pensioner, a student or a housewife. And so the outer lattice is the lattice correspondent to this employment related attributes. Now, we put the education lattice, the diagram of education lattice inside every node of the diagram of the employment lattice, so we get the nested line diagram. But we mark, we represent only some of the inner lattice nodes with a solid circles. And these are those that correspond to attribute combinations that are realized among optics that fall under the other concept. Well, more precisely, if we have a concept A-B, represented by solid circle inside the concept C-D often out the lattice. Then, this corresponds to the global concept, A intersection C, B union D. And this is how it can represent all concept. Inside the alta-node corresponding to pensioner, we have two solid circles. One corresponds to pensioners with college education, and the other corresponds to pensioners with higher education. If we look at the concept of people working in education, we can see only one solid node there. The bottom one. And this means that all people working in education, their own education is higher education. So their own level of education is higher education. So here, the principles is that we can split the presentation into several levels. And consider each level individually. [MUSIC]