Something like a 'clear' attribute for <li> elements?

Is there an attribute or some other mechanism I can use to cause the <li> containing "Item 4:1" to display on the next line (i.e. as if there wasn't enough space for it to fit on the current line even though there is enough space).  Something like the "clear" attribute for floats?  I need a mechism to do this whenever the first <li> element (first of 3 in the <ul>) matches specific criteria.  Thanks--

 

<style>

      ul.ltr#word-by-word-units
      {
        border: 1px solid red;*/
        margin: 0;
        padding: 0;
        direction: ltr;
        text-align: left;
      }


      ul#word-by-word-units li {
        display: inline-block;
        vertical-align: top;
        border: 1px solid Gainsboro;
        margin: 0;
        padding: 0;
      }

      ul#word-by-word-fields
      {
        list-style-type: none; /* no "markers" i.e. bullets */
        border: 1px solid green;
        margin: 0 0 15px 0; /* between each <ul> */
        padding: 0;
      }

      ul#word-by-word-fields li
      {
        vertical-align: top;
        border: 1px solid blue;
        display: block;
        padding: 5px;
      }
</style>

<ul id="word-by-word-units" class="ltr"><li><ul id="word-by-word-fields"><li>Item 1:1</li><li>Item 1:2</li><li>Item 1:3</li></ul><li><ul id="word-by-word-fields"><li>Item 2:1</li><li>Item 2:2</li><li>Item 2:3</li></ul><li><ul id="word-by-word-fields"><li>Item 3:1</li><li>Item 3:2</li><li>Item 3:3</li></ul><li><ul id="word-by-word-fields"><li>Item 4:1</li><li>Item 4:2</li><li>Item 4:3</li></ul><li><ul id="word-by-word-fields"><li >Item 5:1</li><li>Item 5:2</li><li>Item 5:3</li></ul><li><ul id="word-by-word-fields"><li>Item 6:1</li><li>Item 6:2</li><li>Item 6:3</li></ul><li><ul id="word-by-word-fields"><li>Item 7:1</li><li>Item 7:2</li><li>Item 7:3</li></ul></ul>

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