For example, let
<ul>
<li> L = {fun, ha, oil}
<li> R = {et, let, roe}
</ul>
Then
<ul>
<li> L perfect-shuffle R = {fluent, fruone, heat, olielt, oriole}
<li> R perfect-shuffle L = {lfeutn, rfouen, ehta, loeitl, rooiel}
</ul>