anchor.diff:  
   
   DivElement div;
  +SanityChecker sanityChecker;
   Map<String, SessionSummary> cache;
   void main() {
       globalInit();
       loadNavbar();
       div = querySelector("#story");
       listTodos();
  +    sanityChecker = new SanityChecker();
       drawCache();
   }
   
  
positive.code: 
  
  void addMVPRow(TableElement table, SessionSummary s1, SessionSummary s2) {
      TableRowElement tr = new TableRowElement();
      table.append(tr);
      TableCellElement td1 = new TableCellElement();
  
negative.code:     }
  }
  
  
  
  void drawOneSummary(SessionSummary summary) {
      sanityChecker.initial_seed = summary.session_id;
      DivElement container = new DivElement();
      div.append(container);
      //every thing past this can be async.
  