Is it possible to strip the iterable below without resorting to a list comprehension?

```
>>> values=f.df['AvailableInTerritories'].tolist()
>>> values
['AU, CA,GB,US', 'AU, CA, GB, US', 'AU, AT, CA, GB, US', 'AU, CA, GB, US', 'AU, CA, GB, US']
>>> list_separator=','

>>> [item.strip() for item in itertools.chain.from_iterable((str(_val).split(list_separator) for _val in values))]
['AU', 'CA', 'GB', 'US', 'AU', 'CA', 'GB', 'US', 'AU', 'AT', 'CA', 'GB', 'US', 'AU', 'CA', 'GB', 'US', 'AU', 'CA', 'GB', 'US']

```