@function ballistic-unique($list, $recursive: false, $remove: ()) {
  $result: ();


  @each $item in $list {
    @if not index($result, $item) and not index($remove, $item) {
      @if type-of($item) == "list" and $recursive {
        $_result: ballistic-unique($item, $recursive, $remove: $result);

        @if $_result != () {
          $result: append($result, $_result);
        }
      }

      @else {
        $result: append($result, $item);
      }
    }
  }

  @return $result;
}