 
                   7 steps
wm1433wm1433
               
                       signature
                   
                   22→42
                       rule
                   
                    
                       {{{1, 2}, {1, 3}} -> {{2, 4}, {2, 4}, {2, 1}, {3, 4}}}
{{{1, 2}, {1, 3}} -> {{2, 4}, {2, 4}, {2, 1}, {3, 4}}}