code: def insert_ngram(self, ngram, count):
          
          query = "INSERT INTO _{0}_gram {1};".format(len(ngram),
              self._build_values_clause(ngram, count))
          self.execute_sql(query)
docs: Inserts a given n-gram with count into the database.
  
          Parameters
          ----------
          ngram : iterable of str
              A list, set or tuple of strings.
          count : int
              The count for the given n-gram.