<div data-mdb-sortable-init class="sortable-list d-flex">

  <div class="chunk mx-2 px-2"></div>

  <div class="chunk sortable-item mx-2 px-2">PL</div>

  <div class="chunk sortable-item mx-2 px-2">EN</div>

  <div class="chunk sortable-item mx-2 px-2">TY</div>

  <div class="chunk mx-2 px-2">__</div>

  <div class="chunk sortable-item mx-2 px-2">OF</div>

  <div class="chunk mx-2 px-2">__</div>

  <div class="chunk sortable-item mx-2 px-2">FU</div>

<div class="chunk sortable-item mx-2 px-2" >N</div>

</div>