user: You are a structured reasoning expert tasked with solving problems step by step. 
You first think about the reasoning process in the mind and then provide the answer. The reasoning process and answer should be enclosed within <think> </think> and <answer> </answer> tags, respectively, i.e., <think> reasoning process here </think> <answer> answer here </answer>. 
Given a question and the associated knowledge graph triplets (entity, relation, entity), you are asked to answer the question with these triplets and your own knowledge. 
You can break down the original question into several sub-questions and explore the given knowledge graph to solve them step-by-step. If there are multiple possible answers, choose one as the final answer. 
After thinking, when you finally reach a conclusion, clearly state the answer within <answer> </answer> tags, i.e., <answer> answer here </answer>. 
Question: When was the actor who portrayed  Cmdr. Casey Abbott sworn in as president? 
Knowledge Triplets: Cmdr. Casey Abbott, film.performance.character, m.03l8pt3
Ronald Reagan 1981 presidential inauguration, symbols.namesake.named_after, Ronald Reagan
m.03l8pt3, film.actor.film, Ronald Reagan
Ronald Reagan 1985 presidential inauguration, base.inaugurations.inauguration.inaugural_address, Second Inaugural Address of Ronald Reagan
m.03l8pt3, film.performance.film, Hellcats of the Navy
Fictional Character, freebase.type_profile.strict_included_types, Topic
Film character, type.type.expected_by, Character using Wham-O product
Cmdr. Casey Abbott, common.topic.notable_types, Film character
United States Capitol, location.location.events, Ronald Reagan 1981 presidential inauguration
Ronald Reagan 1985 presidential inauguration, base.culturalevent.event.event_type, Historical event
Topic, freebase.type_profile.kind, Portrayal
Ronald Reagan 1981 presidential inauguration, time.event.end_date, 1981-01-20
Film character, type.type.expected_by, Character
m.05c1r_h, dataworld.gardening_hint.replaced_by, Ronald Reagan 1981 presidential inauguration
Film character, type.type.domain, Film
Ronald Reagan 1985 presidential inauguration, time.event.start_date, 1985-01-20
Ronald Reagan 1981 presidential inauguration, base.culturalevent.event.entity_involved, Ronald Reagan
Ronald Reagan 1981 presidential inauguration, base.inaugurations.inauguration.inaugural_address, First Inaugural address of Ronald Reagan
m.0n5qh2k, dataworld.gardening_hint.last_referenced_by, Ronald Reagan 1981 presidential inauguration
Film character, type.type.expected_by, Other conquests
Film character, type.type.properties, Portrayed in films (dubbed)
Character, rdf-schema#range, Film character
m.03l8pt3, film.performance.actor, Ronald Reagan
Hellcats of the Navy, film.film.starring, m.03l8pt3
Film character, freebase.type_hints.included_types, Fictional Character
Ronald Reagan 1981 presidential inauguration, time.event.start_date, 1981-01-20
Ronald Reagan 1981 presidential inauguration, time.event.locations, United States Capitol
Ronald Reagan 1981 presidential inauguration, time.event.locations, Washington, D.C.
Ronald Reagan, symbols.name_source.namesakes, Ronald Reagan 1981 presidential inauguration
Ronald Reagan, symbols.namesake.named_after, Ronald Reagan 1981 presidential inauguration
Film character, freebase.type_profile.published, Published
Character, owl#inverseOf, Portrayed in films
Ronald Reagan, base.inaugurations.inauguration_speaker.inauguration, Ronald Reagan 1981 presidential inauguration
Ronald Reagan 1981 presidential inauguration, time.event.instance_of_recurring_event, United States presidential inauguration
Ronald Reagan 1985 presidential inauguration, time.event.locations, United States Capitol
Film character, freebase.type_profile.strict_included_types, Topic
Film character, freebase.type_hints.included_types, Topic
Ronald Reagan 1985 presidential inauguration, time.event.instance_of_recurring_event, United States presidential inauguration
Ronald Reagan, base.inaugurations.inauguration.president, Ronald Reagan 1985 presidential inauguration
Film character, freebase.type_profile.strict_included_types, Fictional Character
Ronald Reagan 1981 presidential inauguration, base.inaugurations.inauguration.president, Ronald Reagan
Ronald Reagan, film.actor.film, m.03l8pt3
Fictional Character, freebase.type_hints.included_types, Topic
Ronald Reagan 1985 presidential inauguration, time.event.end_date, 1985-01-21
Washington, D.C., location.location.events, Ronald Reagan 1985 presidential inauguration
Fictional Character, freebase.type_profile.kind, Portrayal
Ronald Reagan 1985 presidential inauguration, base.culturalevent.event.entity_involved, Ronald Reagan
Ronald Reagan 1985 presidential inauguration, time.event.locations, White House
Film, type.domain.types, Film character
Cmdr. Casey Abbott, film.film_character.portrayed_in_films, m.03l8pt3
Film character, freebase.type_profile.kind, Annotation
Film character, common.topic.article, m.02_96_z
Second Inaugural Address of Ronald Reagan, base.inaugurations.inaugural_speech.inauguration, Ronald Reagan 1985 presidential inauguration
Ronald Reagan, base.inaugurations.inauguration_speaker.inauguration, Ronald Reagan 1985 presidential inauguration
Fictional Character, freebase.type_profile.published, Published
Film character, type.type.expected_by, Killed by
Ronald Reagan 1985 presidential inauguration, time.event.locations, Washington, D.C.
Ronald Reagan 1981 presidential inauguration, base.culturalevent.event.event_type, Historical event
Character, type.property.expected_type, Film character
Film character, freebase.type_profile.kind, Portrayal
m.05c0rxl, dataworld.gardening_hint.replaced_by, Ronald Reagan 1985 presidential inauguration
United States Capitol, location.location.events, Ronald Reagan 1985 presidential inauguration
White House, location.location.events, Ronald Reagan 1985 presidential inauguration
Film character, type.type.properties, Portrayed in films
United States presidential inauguration, time.recurring_event.instances, Ronald Reagan 1985 presidential inauguration
m.03l8pt3, film.performance.character, Cmdr. Casey Abbott
Washington, D.C., location.location.events, Ronald Reagan 1981 presidential inauguration
Ronald Reagan 1985 presidential inauguration, base.inaugurations.inauguration.president, Ronald Reagan
United States presidential inauguration, time.recurring_event.instances, Ronald Reagan 1981 presidential inauguration
Character, type.property.reverse_property, Portrayed in films
Topic, freebase.type_profile.published, Published
Cmdr. Casey Abbott, common.topic.notable_for, g.12h324478
First Inaugural address of Ronald Reagan, base.inaugurations.inaugural_speech.inauguration, Ronald Reagan 1981 presidential inauguration

Answer: Ronald Reagan 1981 presidential inauguration
Ronald Reagan 1985 presidential inauguration