
6 steps
wm7992wm7992
signature
22→42
rule

{{{1, 2}, {2, 3}} -> {{4, 2}, {2, 1}, {1, 4}, {4, 3}}}
{{{1, 2}, {2, 3}} -> {{4, 2}, {2, 1}, {1, 4}, {4, 3}}}