  In (Nucci M.C. 1994, Physica D 78 p.124), we have found that iterations of
the nonclassical symmetries method give rise to new nonlinear equations, which
inherit the Lie point symmetry algebra of the given equation. In the present
paper, we show that special solutions of the right-order heir-equation
correspond to classical and nonclassical symmetries of the original equations.
An infinite number of nonlinear equations which possess nonclassical symmetries
are derived.
