anchor.diff:          "title": "Common Core Math",
           "count": 9072
           }
  +        ]
           }
           
   ## Grade Groups [/grade_groups.json{?standard_group}]
  
positive.code: Within categories there are individual standards. This method of organizing standards was created by the Common Core State Standards, 
  but we use it to structure all standard groups.
  
  ## Standard Groups [/standard_groups]
  To navigate the standards hierarchies you first need to get the list of standard groups.
  
  ### GET
  
  Retrieve full list of standard groups 
  
  
  + Response 200 (application/json)
  
  
negative.code:         }
      
          
  ## Categories [/categories.json{?standard_group,grade_group,grade}]
  
  ### GET
  You can list the categories (also known as "strands") based on several criteria. 
  