Monomial symmetrization, characterized was characterized as a "pedestrian approach" and is illustrated by the simple example given by Equation . It is described in detail with more examples in the 2009 reveiw and in the 2010 paper by Xie and Bowman, which reported efficient algorithm and software to generate the PIPs using monommial symmetrization. Here we just briefly review this approach. To begin, consider a representation of the potential in terms of monomials, which for a space of six variables is given by