code: def dedup_search_results(search_results):
      
  
      known = set()
      deduped_results = []
  
      for i in search_results:
  
          username = i['username']
  
          if username in known:
              continue
  
          deduped_results.append(i)
  
          known.add(username)
  
      return deduped_results
docs: dedup results