Sass styling properties for child element

Question

ul {
      margin: 0;
      list-style: none;
      li {
        display: inline-block; 
        padding: 0 15px;
        border-right: 1px solid #666666;
        line-height: 14px;
        &:last-child {
          border-right: 0;
        }
      }
    }
  }