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Also , cast members Christopher Knight , Susan Olsen , Mike Lookinland , Barry Williams , Ann B. Davis , and creator Sherwood Schwartz reflect on the impact of the show on their lives .
 person: Christopher Knight; person: Susan Olsen; person: Mike Lookinland; person: Barry Williams; person: Ann B. Davis; person: Sherwood Schwartz
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 person: Christopher Knight; person: Susan Olsen; person: Mike Lookinland; person: Barry Williams; person: Ann B. Davis; person: Sherwood Schwartz