a precess production

precess-input-1431960634.scss

nav{
  border: 1px solid #ddd;
  ul{
    margin: 0;
    li{
      list-style: none;
      a{
        color: red;
      }//a
    }//li
  }//ul
}//nav
//try not to nest more than 3 levels deep

precess-output-1431960634.css

nav {
  border: 1px solid #ddd;
}
nav ul {
  margin: 0;
}
nav ul li {
  list-style: none;
}
nav ul li a {
  color: red;
}