It is the one that contains all polygons sorted concave data ( m, r, n ) greater than r, r greater than n, n greater or equal that one, which is divided in congruent diamond or rhomboid congruent and that limited him a square and a rhombus respectively, also contains all congruent parallelograms order ( m, r ) m greater than r, r greater than or equal to two, and only if, they are squares divided into congruent rectangles or rhombuses divided at rhomboid congruent and through them is supposed that the ordered concave polygons are built forms only one respectively.