They are those that contain all the polygons sorted concave data ( m, r, n ) m greater than r, r greater than n, n greater or equal to one, which are divided into diamonds consistent or congruent rhomboid and which are limited him a rectangle and a diamond shape respectively. In shape one side more and less than the circumscribed parallelogram can be divided m and r times with the major and minor of congruent parallelograms length respectively.