code: def assemble_graph():
      
      if request.method == 'OPTIONS':
          return {}
      response = request.body.read().decode('utf-8')
      body = json.loads(response)
      stmts_json = body.get('statements')
      stmts = stmts_from_json(stmts_json)
      ga = GraphAssembler(stmts)
      model_str = ga.make_model()
      res = {'model': model_str}
      return res
docs: Assemble INDRA Statements and return Graphviz graph dot string.