title: what is the difference between col-lg-4 and col-md-3 and col-xs-3?
body: <p>For the field size i gave col-lg-4 and col-Md-3 and col-XS-2.but at last the column size is 4 only then why we need col-MD-3 and col-XS-2.explain me please...</p>
  
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