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  • 
    $colors = get_field( 'cor' );
    
    // Create a comma-separated list from selected values.
    if ($colors) {  
      $boxes = array();
      foreach ($colors as $color) {
        $boxes[] = '<span style="height: 20px; width: 20px; margin-right: 3px; position: relative; background-color: '.$color.';"></span>';
      }
      echo implode(', ', $boxes);
    }