title: How to remove duplicate comma separated character values from each cell of a column using R
body: <p>I have a data-frame with 2 columns ID and Product as below :</p>
  
  <pre><code>ID  Product
  A   Clothing, Clothing Food, Furniture, Furniture
  B   Food,Food,Food, Clothing
  C   Food, Clothing, Clothing
  </code></pre>
  
  <p>I need to have only unique products for each ID, for example :</p>
  
  <pre><code>ID  Product
  A   Clothing, Food, Furniture
  B   Food, Clothing
  C   Food, Clothing
  </code></pre>
  
  <p>How do I do this using R</p>