code: def get_unique_variable_names(text, nb):
      '''returns a list of possible variables names that
         are not found in the original text.'''
      base_name = '__VAR_'
      var_names = []
      i = 0
      j = 0
      while j < nb:
          tentative_name = base_name + str(i)
          if text.count(tentative_name) == 0 and tentative_name not in ALL_NAMES:
              var_names.append(tentative_name)
              ALL_NAMES.append(tentative_name)
              j += 1
          i += 1
      return var_namef get_unique_variable_names(text, nb):
      '''returns a list of possible variables names that
         are not found in the original text.'''
      base_name = '__VAR_'
      var_names = []
      i = 0
      j = 0
      while j < nb:
          tentative_name = base_name + str(i)
          if text.count(tentative_name) == 0 and tentative_name not in ALL_NAMES:
              var_names.append(tentative_name)
              ALL_NAMES.append(tentative_name)
              j += 1
          i += 1
      return var_names
docs: returns a list of possible variables names that
         are not found in the original text.