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              <div class="container">
  <div class="row">
  <div class="col-xs-6 col-sm-3">
    <p><strong>primeira coluna</strong> - .col-xs-6 .col-sm-3 - Esta coluna possui um tamanho maior. Experimente diminuir o tamanho do viewport para ver o que acontece nos dois exemplos</p>
    </div>
  <div class="col-xs-6 col-sm-3">
    <p><strong>segunda coluna</strong> - .col-xs-6 .col-sm-3</p>
    </div>

  <!-- Este é um clearfix adicionado apenas para o tamanho que for necessário -->
  <div class="clearfix visible-xs-block"></div>

  <div class="col-xs-6 col-sm-3">
    <p><strong>terceira coluna</strong> - .col-xs-6 .col-sm-3</p>
    </div>
  <div class="col-xs-6 col-sm-3">
    <p><strong>quarta coluna</strong> - .col-xs-6 .col-sm-3</p>
    </div>
</div>
  <h2>Compare com o exemplo abaixo onde o "clearfix" não foi usado</h2>
  <h3>Veja este exemplo em um tamanho menor que 768px</h3>
  <div class="row">
  <div class="col-xs-6 col-sm-3">
    <p><strong>primeira coluna</strong> - .col-xs-6 .col-sm-3 - Esta coluna possui um tamanho maior. Experimente diminuir o tamanho do viewport para ver o que acontece nos dois exemplos</p>
    </div>
  <div class="col-xs-6 col-sm-3">
    <p><strong>segunda coluna</strong> - .col-xs-6 .col-sm-3</p>
    </div>

  <!-- Aqui era para ser colocado o clearfix -->
  

  <div class="col-xs-6 col-sm-3">
    <p><strong>terceira coluna</strong> - .col-xs-6 .col-sm-3 - Esta coluna fica encavalada, bagunçando a ordem do layout</p>
    </div>
  <div class="col-xs-6 col-sm-3">
    <p><strong>quarta coluna</strong> - .col-xs-6 .col-sm-3</p>
    </div>
</div>
  
</div>

            
          
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