8 Columns in Twitter Bootstrap

<div class="row">
      <div class="col-xs-6">
            <div class="row">
                <div class="col-xs-3">
                            1
                </div>
                <div class="col-xs-3">
                            2
                </div>
                <div class="col-xs-3">
                            3
                </div>
                <div class="col-xs-3">
                            4
                </div>
          </div>
    </div> 
    <div class="col-xs-6">
            <div class="row">
                <div class="col-xs-3">
                            5   
                </div>
                <div class="col-xs-3">
                            6
                </div>
                <div class="col-xs-3">
                            7
                </div>
                <div class="col-xs-3">
                            8
                </div>
          </div>
    </div>
</div>