title: Cross matrix values in R
body: <p>Consider I have a list of products : For example 100 product names 
                Product$list
                    A
                    B
                    C</p>
  
  <p>I want 100 * 100 combination in Product$list1 and Product$list2
     Example:3*3 = 9 combinations</p>
  
  <pre><code>         Product$list1       Product$list2
                A                   B
                A                   C
                B                   A
                B                   C
                C                   A
                C                   B
                A                   A
                B                   B
                C                   C
  </code></pre>
  
  <p>Can somebody help me how to achieve this in R.</p>