Question: What is the writing principle that suggests that events or characters introduced in threes are more humorous, satisfying, or effective in execution of the story and engaging the reader and is used in a novel featuring Allison Gross, a hideous witch?
{'answer': 'rule of three', 'supporting_facts': [['Allison Gross', 0], ['Allison Gross', 4], ['Rule of three (writing)', 0]]}