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 has been the Attorney General of the location with an official symbol called Populus? 
Knowledge Triplets: m.0hzbyqy, government.government_position_held.basic_title, Attorney general
Acer saccharum, base.landcover.dominant_cover.land_cover_map_class_es, Northern Hardwood Forest
Sean Reyes, government.politician.government_positions_held, m.0zxk98b
Government Office or Title, type.type.properties, Governmental body (if any)
QuakiesSEP2005, common.image.appears_in_topic_gallery, Populus tremuloides
Populus, biology.organism_classification.lower_classifications, g.12tb80v0d
Northern Hardwood Forest, base.landcover.land_cover_class.dominant_species_cover, Betula populifolia
m.0zxk98b, government.government_position_held.office_position_or_title, Utah Attorney General
Utah Attorney General, government.government_office_or_title.office_holders, m.0hzbyqy
Populus, biology.organism_classification.higher_classification, Salicaceae
Populus, biology.organism_classification.lower_classifications, Populus × canescens
m.0hzbyqy, government.government_position_held.office_holder, Mark Shurtleff
Northern Hardwood Forest, base.landcover.land_cover_class.dominant_species_cover, Fagus grandifolia
Populus tremuloides, base.landcover.dominant_cover.land_cover_map_class_es, Northern Hardwood Forest
Utah, government.governmental_jurisdiction.governing_officials, m.0hzbyqy
Populus, biology.organism_classification.lower_classifications, Populus ilicifolia
Government Office or Title, freebase.type_hints.included_types, Topic
m.011jr83w, location.location_symbol_relationship.symbol, Populus tremuloides
m.0hzbyqy, government.government_position_held.jurisdiction_of_office, Utah
Populus, biology.organism_classification.lower_classifications, g.155rccsd
Utah Attorney General, government.government_office_or_title.office_holders, m.0hzbyqy
Populus, biology.organism_classification.lower_classifications, g.155qr0d9
m.0nbwncq, government.government_position_held.basic_title, Attorney general
Populus, biology.organism_classification.lower_classifications, Populus tremula
Populus, biology.organism_classification.lower_classifications, g.121bwqw2
Northern Hardwood Forest, base.landcover.classification_code.classification_system, Vermont Natural Community Types
Male, people.person.gender, John Swallow
Populus, visual_art.visual_art_support.artworks, Annunciation
Northern Hardwood Forest, base.landcover.land_cover_class.dominant_species_cover, Betula alleghaniensis
Populus, biology.organism_classification.lower_classifications, g.121fx5gp
Organism Classification, freebase.type_profile.strict_included_types, Topic
Mark Shurtleff, people.person.gender, Male
Populus tremuloides, common.topic.image, QuakiesSEP2005
Populus, biology.organism_classification.lower_classifications, Populus ciliata
Betula papyrifera, common.topic.notable_types, Organism Classification
Sean Reyes, people.person.gender, Male
Populus, biology.organism_classification.lower_classifications, g.155sww96
Populus, biology.organism_classification.lower_classifications, g.155r80nd
Populus, biology.organism_classification.lower_classifications, Populus angustifolia
Official symbol, type.type.expected_by, Symbol
Populus, biology.organism_classification.lower_classifications, g.155sjf1r
Utah Attorney General, government.government_office_or_title.office_holders, m.0zxk98b
Utah Attorney General, government.government_office_or_title.office_holders, m.0nbwncq
Populus, biology.organism_classification.lower_classifications, g.123922jd
Populus, biology.organism_classification.lower_classifications, Populus trichocarpa
Office, position, or title, rdf-schema#range, Government Office or Title
Populus, common.topic.notable_for, g.12571_dly
Utah, government.governmental_jurisdiction.official_symbols, m.011jr83w
Populus tremuloides, common.topic.notable_for, g.125ctt1z2
Populus, biology.organism_classification.lower_classifications, Populus sect. Populus
Populus, biology.organism_classification.lower_classifications, g.155qfpvn
Madonna of Laroque, visual_art.artwork.support, Populus
Organism Classification, freebase.type_hints.included_types, Topic
Populus, biology.organism_classification.lower_classifications, g.12tb7nrlr
Pando, common.topic.article, m.0dkxp8
Populus, biology.organism_classification.lower_classifications, Populus grandidentata
Populus, biology.organism_classification.lower_classifications, g.155rsh6r
Populus, biology.organism_classification.lower_classifications, g.121_tx4j
Populus, biology.organism_classification.lower_classifications, g.121lbcqt
Official symbol, freebase.type_hints.included_types, Topic
Government Office or Title, freebase.type_profile.strict_included_types, Non-Agent
Utah Attorney General, common.topic.notable_for, g.1255jv5ff
Populus, biology.organism_classification.lower_classifications, g.155qc0td
Madonna of the Carnation, visual_art.artwork.support, Populus
Populus, biology.organism_classification.lower_classifications, g.1230jznw
m.0nbwncq, government.government_position_held.office_holder, John Swallow
Official symbol, common.topic.article, m.046280v
Populus, biology.organism_classification.lower_classifications, g.12tb87bh3
m.0nbwncq, government.government_position_held.office_holder, John Swallow
m.0zxk98b, government.government_position_held.office_holder, Sean Reyes
Populus, biology.organism_classification.lower_classifications, Populus adenopoda
Government Office or Title, freebase.type_profile.published, Published
Populus, biology.organism_classification.lower_classifications, Populus guzmanantlensis
John Swallow, people.person.gender, Male
Populus, biology.organism_classification.lower_classifications, g.12tb83nvl
Office, position, or title, type.property.reverse_property, Office Holders
Populus, biology.organism_classification.lower_classifications, g.11b60s1xq6
Populus, visual_art.visual_art_support.artworks, Spoliarium
Populus, biology.organism_classification.lower_classifications, g.155rycpy
m.0nbwncq, government.government_position_held.office_position_or_title, Utah Attorney General
Mark Shurtleff, government.politician.government_positions_held, m.0hzbyqy
Populus tremuloides, location.symbol_of_administrative_division.official_symbol_of, m.011jr83w
Populus, biology.organism_classification.lower_classifications, 山楊
Populus, biology.organism_classification.lower_classifications, g.12tb86dw8
Populus, biology.organism_classification.lower_classifications, g.155sk04p
Populus tremuloides, common.topic.article, m.0fvj7c
Populus, biology.organism_classification.lower_classifications, g.120vz0nb
Government Office or Title, type.type.expected_by, Government positions
QuakiesSEP2005, common.image.size, m.02911bg
Organism Classification, freebase.type_profile.strict_included_types, Abstract
Northern Hardwood Forest, base.landcover.land_cover_class.additional_species_cover, Viburnum lantanoides
Government Office or Title, freebase.type_profile.kind, Definition
Populus, biology.organism_classification.lower_classifications, Populus × jackii
Office, position, or title, owl#inverseOf, Office Holders
Populus, biology.organism_classification.lower_classifications, g.12tb829db
Populus, visual_art.visual_art_support.artworks, Madonna of Laroque
Populus tremuloides, biology.organism_classification.organisms_of_this_type, Pando
Populus, visual_art.visual_art_support.artworks, Portrait of an Elderly Man
Populus, common.topic.image, Foliage of Populus tremula
Northern Hardwood Forest, base.landcover.land_cover_class.dominant_species_cover, Populus tremuloides
Government Office or Title, freebase.type_profile.strict_included_types, Topic
Pando, common.topic.notable_for, g.125583_6p
Populus, common.topic.notable_types, Organism Classification
m.0zxk98b, government.government_position_held.basic_title, Attorney general
Populus, common.topic.image, Populus tremula 002
Government Office or Title, type.type.expected_by, Office, Position, or Title
m.011jr83w, location.location_symbol_relationship.Kind_of_symbol, State tree
m.0hzbyqy, government.politician.government_positions_held, Mark Shurtleff
Populus, biology.organism_classification.lower_classifications, Populus wilsonii
Populus, biology.organism_classification.lower_classifications, g.12tb7pkqh
Government Office or Title, type.type.expected_by, Office
Betula papyrifera, base.landcover.dominant_cover.land_cover_map_class_es, Northern Hardwood Forest
Government Office or Title, type.type.expected_by, Offices/Positions Within the Body
Populus, biology.organism_classification.lower_classifications, g.1212mgfr
Populus, biology.organism_classification.lower_classifications, g.155qb23w
Populus, visual_art.visual_art_support.artworks, Vision of a Knight
Populus tremuloides, biology.organism_classification.organisms_of_this_type, Pando
Populus, biology.organism_classification.lower_classifications, g.12tb7_l2k
Populus tremuloides, biology.organism_classification.higher_classification, Populus
Populus, biology.organism_classification.lower_classifications, g.155sbb7x
m.0nbwncq, government.government_position_held.jurisdiction_of_office, Utah
Populus, biology.organism_classification.lower_classifications, g.155qb1vd
Male, people.person.gender, Sean Reyes
Government Office or Title, type.type.properties, Category
Populus, biology.organism_classification.lower_classifications, g.155sbb95
Organism Classification, freebase.type_profile.published, Published
Populus, biology.organism_classification.lower_classifications, g.155ssrvj
Populus, biology.organism_classification.rank, Genus
Populus, biology.organism_classification.lower_classifications, g.155rhj8h
Populus, biology.organism_classification.lower_classifications, g.155rb80f
Populus, biology.organism_classification.lower_classifications, g.12tb7pkf7
Populus, biology.organism_classification.lower_classifications, g.155s532k
Populus, biology.organism_classification.lower_classifications, g.155q5q1d
Government Office or Title, type.type.expected_by, Offices
Annunciation, visual_art.artwork.support, Populus
Populus, biology.organism_classification.lower_classifications, g.155q6y7b
Government Office or Title, type.type.properties, Office Holders
Populus, biology.organism_classification.lower_classifications, g.155q6ycw
Northern Hardwood Forest, base.landcover.land_cover_class.dominant_species_cover, Acer saccharum
Organism, freebase.type_profile.strict_included_types, Topic
Populus, biology.organism_classification.lower_classifications, Populus heterophylla
John Swallow, government.politician.government_positions_held, m.0nbwncq
Pando, biology.organism.sex, Male
Populus, visual_art.visual_art_support.artworks, g.1s05nsvbj
m.011jr83w, location.location_symbol_relationship.administrative_division, Utah
Populus, visual_art.visual_art_support.artworks, The Flight into Egypt
Populus, biology.organism_classification.lower_classifications, g.12tb7_lmp
Populus, biology.organism_classification.lower_classifications, g.11b60v3lyh
Populus, biology.organism_classification.lower_classifications, g.155r0q7t
Pando, biology.organism.sex, Male
Pando, biology.organism.organism_type, Populus tremuloides
Populus, visual_art.visual_art_support.artworks, The Death of Procris
Utah, government.governmental_jurisdiction.governing_officials, m.0zxk98b
Populus, biology.organism_classification.lower_classifications, g.155ph0cz
Populus, biology.organism_classification.lower_classifications, Populus tremuloides
Government Office or Title, type.type.expected_by, Office, position, or title
Utah Attorney General, government.government_position_held.office_position_or_title, m.0nbwncq
Populus, common.topic.article, m.0nbyn
Organism, freebase.type_profile.kind, Definition
Populus, biology.organism_classification.lower_classifications, g.1223dzdg
Populus, biology.organism_classification.lower_classifications, g.155q_g_d
Office, position, or title, type.property.expected_type, Government Office or Title
Populus, biology.organism_classification.lower_classifications, g.155rwtp4
Utah Attorney General, common.topic.notable_types, Government Office or Title
Utah Attorney General, common.topic.article, m.0wbmf2t
Populus, biology.organism_classification.lower_classifications, g.155qnh4b
Government Office or Title, common.topic.article, m.02xlj1v
Populus, biology.organism_classification.lower_classifications, g.11dyk3k4f
Populus, biology.organism_classification.lower_classifications, g.155qndxq
Populus, biology.organism_classification.lower_classifications, g.12tb7t4fb
Populus tremuloides, common.topic.notable_types, Official symbol
State tree, location.offical_symbol_variety.symbols_of_this_kind, m.011jr83w
Utah, government.governmental_jurisdiction.governing_officials, m.0nbwncq
Official symbol, freebase.type_profile.strict_included_types, Topic
Populus, biology.organism_classification.lower_classifications, g.12tb7tpfg
Government Office or Title, type.type.properties, Jurisdiction
Populus, biology.organism_classification.lower_classifications, g.12tb7sqkg
Populus, biology.organism_classification.lower_classifications, g.155pjm83
Populus, biology.organism_classification.lower_classifications, g.155p_339
Populus, biology.organism_classification.lower_classifications, g.155pdjyj
Populus, biology.organism_classification.lower_classifications, g.12tb87w_c
Utah Attorney General, government.government_position_held.office_position_or_title, m.0zxk98b
Pando, common.topic.notable_types, Organism
Populus, biology.organism_classification.lower_classifications, g.120vhfqs
Populus, biology.organism_classification.lower_classifications, Populus nigra
Official symbol, type.type.properties, Official symbol of
Government Office or Title, freebase.type_profile.strict_included_types, Abstract
Vision of a Knight, visual_art.artwork.support, Populus
Mark Shurtleff, common.topic.subjects, Attorney general
Topic, freebase.type_profile.published, Published
Male, people.person.gender, Mark Shurtleff
m.0zxk98b, freebase.valuenotation.has_no_value, To
Populus, biology.organism_classification.lower_classifications, g.11_yl3yfr
Government Office or Title, type.type.domain, Government
QuakiesSEP2005, common.image.appears_in_topic_gallery, Clover Mountains Wilderness
Government Office or Title, type.type.expected_by, Title of Chief Executive
Official symbol, freebase.type_profile.kind, Role
m.0hzbyqy, government.government_position_held.office_position_or_title, Utah Attorney General
Populus, biology.organism_classification.lower_classifications, Populus deltoides
m.0zxk98b, government.government_position_held.office_holder, Sean Reyes
Populus, biology.organism_classification.lower_classifications, Populus balsamifera
Mona Lisa, visual_art.artwork.support, Populus
Pando, common.topic.image, AspenOverview0172
Populus, biology.organism_classification.lower_classifications, g.12tb7svwm
Populus, biology.organism_classification.lower_classifications, g.155qs8vk
Organism, freebase.type_profile.published, Published
Populus, biology.organism_classification.lower_classifications, g.155s4084
Organism, freebase.type_hints.included_types, Topic
Populus, visual_art.visual_art_support.artworks, Mona Lisa
Populus, biology.organism_classification.lower_classifications, g.12tb7pkqj
Organism Classification, freebase.type_profile.kind, Definition
Populus, visual_art.visual_art_support.artworks, Madonna of the Carnation
m.0zxk98b, government.government_position_held.jurisdiction_of_office, Utah
Attorney general, common.topic.subject_of, Mark Shurtleff
Populus, biology.organism_classification.lower_classifications, Populus alba
Official symbol, type.type.domain, Location
Populus, biology.organism_classification.lower_classifications, g.155qnk3b
Northern Hardwood Forest, base.landcover.land_cover_class.dominant_species_cover, Betula papyrifera
Acer saccharum, common.topic.notable_types, Organism Classification
Organism Classification, freebase.type_profile.strict_included_types, Non-Agent

Answer: John Swallow
Mark Shurtleff
Sean Reyes