title: apriori get the list of all items appear in rhs (best with frequency)
body: <p>I want to have a list of item name which in the rhs of apriori with how many number of rules with it</p>
  
  <p>we can use data(Groceries) for example</p>
  
  <pre><code>```
  rules &lt;- apriori (Groceries, 
                parameter = list(supp = 0.001, conf = 0.5)
                ) 
  ```
  </code></pre>
  
  <p>how there is a way to find out the complete list of items are list in rhs in this rules. if we can also have how many rules in this 'rules' related to each item will be best
  this is not item frequency is how many rules have the rhs = 'item'
  e.g.</p>
  
  <p>{whole milk}  2345
  {rolls/buns}   5
    .......</p>