Question: When did the process occur that occurred after the futhorc runes are thought to have been developed, resulting in the Anglo-Saxon runes to also being called the Anglo-Frisian runes?
{'answer': 'mid-fifth to early seventh centuries', 'supporting_facts': [['Anglo-Saxon runes', 0], ['Anglo-Saxon runes', 1], ['Anglo-Saxon runes', 3], ['Anglo-Saxon settlement of Britain', 0], ['Anglo-Saxon settlement of Britain', 2]]}