Defintiton zusammenfassen...

[1UnitedPower]

.menue ul:last-child,
.menue ul li:not(:first-child) > a {
   border-right: 1px solid #fff;
}

.menue ul li ul:last-child,
.menue ul li ul li:not {
   border-right: none;
}

  
Da ist was beim Kopieren verloren gegangen, so sollte es sein  
  
~~~css
.menue ul:last-child, .menue ul li:not(:first-child) > a {border-right: 1px solid #fff;}  
.menue ul li ul:last-child, .menue ul li ul li:not(:first-child) > a {border-right: none;}