html - 8 Columns in Twitter Bootstrap

Question

How can I set up 8 equal columns in the latest version of Twitter bootstrap.

I can create 4 equal columns by doing the following but don't get how I can get 8:

    <div class="col-sm-12">
        <div class="row">
            <div class="col-sm-3">
                <div class="col-sm-12 col-xs-6">
                    <a href="#"><img src="/image.png" class="img-responsive" alt="..."></a>
                </div>
            </div>
            <div class="col-sm-3">
                <div class="col-sm-12 col-xs-6">
                    <a href="#"><img src="/image.png" class="img-responsive" alt="..."></a>
                </div>
            </div>
            <div class="col-sm-3">
                <div class="col-sm-12 col-xs-6">
                    <a href="#"><img src="/image.png" class="img-responsive" alt="..."></a>
                </div>
            </div>
            <div class="col-sm-3">
                <div class="col-sm-12 col-xs-6">
                    <a href="#"><img src="/image.png" class="img-responsive" alt="..."></a>
                </div>
            </div>
        </div>
    </div>

Answer 1

<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>