                                               <span class="identifier">m</span> <span class="special">|</span> <span class="identifier">m</span>   <span class="identifier">m</span>
                                                         <span class="identifier">S</span> <span class="special">|</span> <span class="identifier">S</span> <span class="identifier">S</span>     
                                                         <span class="identifier">M</span> <span class="special">|</span> <span class="