It is the one that contains all polygons sorted concave data ( m, r, n ) greater than r, r greater than n, n greater than or equal to one, which are divided into congruent squares or in congruent rectangles and is circumscribing a rectangle and a diamond shape respectively, also contains all the parallelograms split in order 40 congruent parallelograms; m, r ) m more that r, r greater than or equal to one, if and only if, they are rectangle divided into congruent squares or rhomboids divided in congruent Rhombus and through them is supposed that the ordered concave polygons are built is only two respectively.
