gistfile1.txt

.posts__post {

  @include media(min-width 520px, 6) {
    @include span-columns(3);
  }

  @include media(min-width 520px max-width 767px, 6) {
    @include omega(2);

    &:nth-child(3) {
      display: none;
    }
  }

  @include media(min-width 768px, 14) {
    @include span-columns(4.66);
  }

}