@function ballistic-intersection($array, $others...) {
  $unique: ();

  @each $item in $array {
    @if not index($unique, $item) {
      $unique: append($unique, $item, comma);
    }
  }

  $intersection: ();

  @each $item in $unique {
    $exists: true;

    @each $other in $others {
      @if not index($other, $item) {
        $exists: false;
      }
    }

    @if $exists {
      $intersection: append($intersection, $item, comma);
    }
  }

  @return $intersection;
}