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: Who were the actors that played the character Square Dance Extra's parents? 
Knowledge Triplets: Gladys Pearl Baker, people.person.profession, Film Editor
Green Grass of Wyoming, film.film.starring, m.0gxt07f
m.0kpgnt0, people.marriage.spouse, Martin Edward Mortensen
m.0qf21l5, people.marriage.spouse, Gladys Pearl Baker
Gladys Pearl Baker, people.deceased_person.date_of_death, 1984-03-11
Gladys Pearl Baker, people.person.place_of_birth, Piedras Negras
Gladys Pearl Baker, people.person.children, Marilyn Monroe
m.0vtzrvq, people.sibling_relationship.sibling, Gladys Pearl Baker
Film Editor, people.profession.people_with_this_profession, Gladys Pearl Baker
Gladys Pearl Baker, people.person.spouse_s, m.0kpgnt0
Character, owl#inverseOf, Portrayed in films
Piedras Negras, location.location.people_born_here, Gladys Pearl Baker
Robert Kermitt Baker, people.person.parents, Gladys Pearl Baker
Gladys Pearl Baker, imdb.topic.name_id, nm2913418
Film, type.domain.types, Film character
Character, rdf-schema#range, Film character
Gladys Pearl Baker, people.person.spouse_s, m.0qf21l5
Martin Edward Mortensen, people.person.children, Marilyn Monroe
Della Mae Hogan, people.person.children, Gladys Pearl Baker
Vallejo, location.location.people_born_here, Martin Edward Mortensen
Marilyn Monroe, people.person.parents, Gladys Pearl Baker
Topic, freebase.type_profile.kind, Portrayal
Film character, type.type.expected_by, Killed by
Fictional Character, freebase.type_hints.included_types, Topic
Gladys Pearl Baker, people.deceased_person.place_of_death, Gainesville
Gladys Pearl Baker, people.person.parents, Della Mae Hogan
Marilyn Monroe, film.actor.film, m.0gxt07f
Gladys Pearl Baker, people.person.children, Robert Kermitt Baker
m.0rpz9hz, film.personal_film_appearance.person, Gladys Pearl Baker
Otis Elmer Monroe, people.person.children, Gladys Pearl Baker
Marilyn Monroe, people.person.parents, Martin Edward Mortensen
Film character, type.type.expected_by, Character
Martin Edward Mortensen, people.person.spouse_s, m.0kpgnt0
Film character, freebase.type_profile.kind, Portrayal
Film character, freebase.type_profile.strict_included_types, Topic
Fictional Character, freebase.type_profile.published, Published
Martin Edward Mortensen, people.person.parents, Martin Mortensen
m.0gxt07f, film.actor.film, Marilyn Monroe
Film character, type.type.domain, Film
Film character, type.type.properties, Portrayed in films
Film character, type.type.properties, Portrayed in films (dubbed)
Gladys Pearl Baker, people.person.sibling_s, m.0vtzrvq
Square dance extra, common.topic.notable_for, g.12yydytm2
Character, type.property.reverse_property, Portrayed in films
Film character, freebase.type_profile.strict_included_types, Fictional Character
Film character, common.topic.article, m.02_96_z
Film character, freebase.type_hints.included_types, Topic
Character, type.property.expected_type, Film character
Martin Edward Mortensen, people.person.place_of_birth, Vallejo
Gladys Pearl Baker, people.person.nationality, United States of America
Film character, freebase.type_hints.included_types, Fictional Character
Marilyn Monroe, people.person.parents, Martin Edward Mortensen
Fictional Character, freebase.type_profile.strict_included_types, Topic
Marilyn Monroe, people.person.children, Gladys Pearl Baker
Martin Edward Mortensen, people.deceased_person.date_of_death, 1981
Film character, freebase.type_profile.kind, Annotation
Square dance extra, common.topic.notable_types, Film character
Gladys Pearl Baker, people.person.gender, Female
Film character, type.type.expected_by, Other conquests
Gladys Pearl Baker, people.person.spouse_s, m.0rpzg0q
Square dance extra, film.film_character.portrayed_in_films, m.0gxt07f
Fictional Character, freebase.type_profile.kind, Portrayal
Gladys Pearl Baker, people.person.parents, Otis Elmer Monroe
Gladys Pearl Baker, people.person.date_of_birth, 1902-05-27
Film character, freebase.type_profile.published, Published
Martin Edward Mortensen, people.person.date_of_birth, 1897
m.0gxt07f, film.performance.actor, Marilyn Monroe
Square dance extra, film.film_character.portrayed_in_films, m.0gxt07f
m.0gxt07f, film.performance.character, Square dance extra
Martin Edward Mortensen, people.person.gender, Male
Topic, freebase.type_profile.published, Published
Martin Edward Mortensen, people.person.nationality, United States of America
Berniece Baker Miracle, people.person.parents, Gladys Pearl Baker
m.0rpzg0q, people.marriage.spouse, Gladys Pearl Baker
Film character, type.type.expected_by, Character using Wham-O product
m.0kpgnt0, people.marriage.spouse, Gladys Pearl Baker
Gladys Pearl Baker, people.person.children, Berniece Baker Miracle
Gladys Pearl Baker, film.person_or_entity_appearing_in_film.films, m.0rpz9hz
m.0gxt07f, film.performance.film, Green Grass of Wyoming
Martin Mortensen, people.person.children, Martin Edward Mortensen
m.0gxt07f, film.performance.special_performance_type, Uncredited

Answer: Martin Edward Mortensen
Gladys Pearl Baker