 
                   8 steps
wm4335wm4335
               
                       signature
                   
                   22→42
                       rule
                   
                    
                       {{{1, 2}, {1, 3}} -> {{4, 1}, {1, 2}, {2, 4}, {3, 4}}}
{{{1, 2}, {1, 3}} -> {{4, 1}, {1, 2}, {2, 4}, {3, 4}}}