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: People from the country that has the national anthem Nigeria, We Hail Thee practice what system of government? 
Knowledge Triplets: Presidential system, government.form_of_government.countries, Tajikistan
Russia, location.country.form_of_government, Federal republic
Guatemala, location.country.form_of_government, Presidential system
Presidential system, government.form_of_government.countries, Chechen Republic of Ichkeria
Presidential system, government.form_of_government.countries, Republic of Hawaii
Nigeria, We Hail Thee, music.composition.lyricist, Lillian Jean Williams
Congo, location.country.form_of_government, Presidential system
Presidential system, government.form_of_government.countries, Mozambique
United States of America, location.country.form_of_government, Federal republic
Presidential system, government.form_of_government.countries, Zambia
Northern Mariana Islands, location.country.form_of_government, Presidential system
Italian Social Republic, location.country.form_of_government, Presidential system
South Sudan, location.country.form_of_government, Federal republic
Presidential system, government.form_of_government.countries, Congo
Composition, freebase.type_profile.strict_included_types, Topic
Mexico, location.country.form_of_government, Presidential system
Sudan, location.country.form_of_government, Presidential system
Federal republic, government.form_of_government.countries, Pakistan
Chad, location.country.form_of_government, Presidential system
Presidential system, government.form_of_government.countries, Northern Mariana Islands
Frances Berda, common.topic.notable_for, g.12mk_lcpw
Nigeria We Hail Thee, music.recording.song, Nigeria, We Hail Thee
Weimar Republic, location.country.form_of_government, Federal republic
Presidential system, government.form_of_government.countries, Equatorial Guinea
Comoros, location.country.form_of_government, Federal republic
Ghana, location.country.form_of_government, Presidential system
West Germany, location.country.form_of_government, Federal republic
Lillian Jean Williams, common.topic.notable_types, Lyricist
Guinea, location.country.form_of_government, Presidential system
Topic, freebase.type_profile.published, Published
Presidential system, government.form_of_government.countries, Republic of the Congo
Federal republic, government.form_of_government.countries, Nepal
Chile, location.country.form_of_government, Presidential system
Ecuador, location.country.form_of_government, Presidential system
Sudan, location.country.form_of_government, Federal republic
Presidential system, government.form_of_government.countries, Kyrgyzstan
Presidential system, government.form_of_government.countries, Uzbekistan
Composer, freebase.type_profile.published, Published
Presidential system, government.form_of_government.countries, Venezuela
Composer, freebase.equivalent_topic.equivalent_type, Composer
Presidential system, government.form_of_government.countries, Nicaragua
Lillian Jean Williams, music.lyricist.lyrics_written, Nigeria, We Hail Thee
Equatorial Guinea, location.country.form_of_government, Presidential system
Zambia, location.country.form_of_government, Presidential system
Federal republic, government.form_of_government.countries, Czech and Slovak Federative Republic
Namibia, location.country.form_of_government, Presidential system
Musical Recording, freebase.type_profile.kind, Definition
Federal republic, government.form_of_government.countries, South Sudan
Federal republic, base.ontologies.ontology_instance.equivalent_instances, m.07nhchw
Presidential system, government.form_of_government.countries, United States of America
Presidential system, government.form_of_government.countries, Brazil
South Korea, location.country.form_of_government, Presidential system
Presidential system, government.form_of_government.countries, Colombia
Presidential system, government.form_of_government.countries, Ghana
Angola, location.country.form_of_government, Presidential system
Presidential system, government.form_of_government.countries, Sudan
Colombia, location.country.form_of_government, Presidential system
Nigeria, We Hail Thee, common.topic.notable_types, National Anthem
India, location.country.form_of_government, Federal republic
Pakistan, location.country.form_of_government, Federal republic
Presidential system, government.form_of_government.countries, First Spanish Republic
Republic of Afghanistan, location.country.form_of_government, Presidential system
Presidential system, government.form_of_government.countries, French Second Republic
Philippines, location.country.form_of_government, Presidential system
Presidential system, government.form_of_government.countries, Nigeria
Presidential system, government.form_of_government.countries, Sierra Leone
Confederate States of America, location.country.form_of_government, Presidential system
Presidential system, government.form_of_government.countries, Panama
National Anthem, type.type.domain, Government
Presidential system, government.form_of_government.countries, Guatemala
Presidential system, government.form_of_government.countries, Second Polish Republic
Venezuela, location.country.form_of_government, Presidential system
Nigeria, We Hail Thee, common.topic.notable_for, g.12ml082hv
Tanzania, location.country.form_of_government, Presidential system
Turkmenistan, location.country.form_of_government, Presidential system
Presidential system, government.form_of_government.countries, Paraguay
Guam, location.country.form_of_government, Presidential system
Presidential system, government.form_of_government.countries, Gabon
National Anthem, freebase.type_profile.equivalent_topic, National anthem
Belarus, location.country.form_of_government, Presidential system
Nigeria We Hail Thee, music.recording.releases, Nigerian Wood
Presidential system, government.form_of_government.countries, Chile
Presidential system, government.form_of_government.countries, Mexico
Nigeria We Hail Thee, common.topic.notable_for, g.125d0zj13
Anthem, type.property.expected_type, National Anthem
Frances Berda, music.composer.compositions, Nigeria, We Hail Thee
Presidential system, government.form_of_government.countries, Tanzania
Panama, location.country.form_of_government, Presidential system
Czechoslovak Socialist Republic, location.country.form_of_government, Federal republic
Algeria, location.country.form_of_government, Presidential system
Liberia, location.country.form_of_government, Presidential system
Federal republic, government.form_of_government.countries, Mexico
Ethiopia, location.country.form_of_government, Federal republic
National Anthem, common.topic.article, m.03nbgmy
Presidential system, government.form_of_government.countries, Transnistria
Republic of Hawaii, location.country.form_of_government, Presidential system
Mozambique, location.country.form_of_government, Presidential system
Nigeria, government.form_of_government.countries, Federal republic
Composition, freebase.type_hints.included_types, Topic
Presidential system, government.form_of_government.countries, Gambia
Federal republic, government.form_of_government.countries, Tanzania
Presidential system, government.form_of_government.countries, Uruguay
Composer, freebase.type_profile.equivalent_topic, Composer
Anthem, type.property.master_property, National anthem of
Federal republic, government.form_of_government.countries, West Germany
Iraq, location.country.form_of_government, Federal republic
National Anthem, type.type.expected_by, Anthem
Federal republic, government.form_of_government.countries, Switzerland
Federal republic, government.form_of_government.countries, Weimar Republic
Lillian Jean Williams, people.person.profession, Lyricist
United Arab Emirates, location.country.form_of_government, Presidential system
Composer, freebase.type_hints.included_types, Topic
Presidential system, government.form_of_government.countries, Maldives
Nicaragua, location.country.form_of_government, Presidential system
Federal republic, government.form_of_government.countries, Socialist Federal Republic of Yugoslavia
United States of America, location.country.form_of_government, Presidential system
Composer, freebase.type_profile.strict_included_types, Topic
Federal republic, government.form_of_government.countries, Sudan
Second Polish Republic, location.country.form_of_government, Presidential system
Presidential system, government.form_of_government.countries, Italian Social Republic
Nigeria, We Hail Thee, music.composition.recordings, Nigeria We Hail Thee
Presidential system, government.form_of_government.countries, South Korea
Palau, location.country.form_of_government, Presidential system
Presidential system, government.form_of_government.countries, Seychelles
Ivory Coast, location.country.form_of_government, Presidential system
Presidential system, government.form_of_government.countries, Guinea
Presidential system, government.form_of_government.countries, Puntland
Presidential system, government.form_of_government.countries, Malawi
Federal republic, government.form_of_government.countries, Iraq
Argentina, location.country.form_of_government, Presidential system
Presidential system, government.form_of_government.countries, Republic of Texas
Federal republic, government.form_of_government.countries, Argentina
Federal republic, government.form_of_government.countries, Ethiopia
Presidential system, government.form_of_government.countries, Algeria
Brazil, location.country.form_of_government, Presidential system
Lyricist, freebase.type_profile.published, Published
Federal republic, government.form_of_government.countries, Russia
Nigeria, location.country.form_of_government, Presidential system
Argentina, location.country.form_of_government, Federal republic
South Sudan, location.country.form_of_government, Presidential system
Yemen, location.country.form_of_government, Presidential system
Presidential system, government.form_of_government.countries, Marshall Islands
Brazil, location.country.form_of_government, Federal republic
Federal republic, government.form_of_government.countries, Somalia
National Anthem, freebase.type_profile.strict_included_types, Topic
Presidential system, government.form_of_government.countries, Peru
Federal republic, government.form_of_government.countries, India
Nigeria We Hail Thee, common.topic.notable_types, Musical Recording
Federated States of Micronesia, location.country.form_of_government, Presidential system
Lyricist, freebase.type_profile.strict_included_types, Topic
Presidential system, government.form_of_government.countries, Belarus
Presidential system, government.form_of_government.countries, Myanmar
Presidential system, government.form_of_government.countries, Angola
Transnistria, location.country.form_of_government, Presidential system
Bolivia, location.country.form_of_government, Presidential system
Presidential system, government.form_of_government.countries, Uganda
Presidential system, government.form_of_government.countries, Confederate States of America
Czech and Slovak Federative Republic, location.country.form_of_government, Federal republic
National Anthem, freebase.type_profile.strict_included_types, Composition
National Anthem, type.type.properties, National anthem of
Kazakhstan, location.country.form_of_government, Presidential system
First Spanish Republic, location.country.form_of_government, Presidential system
Kyrgyzstan, location.country.form_of_government, Presidential system
Presidential system, government.form_of_government.countries, Namibia
Myanmar, location.country.form_of_government, Presidential system
Presidential system, government.form_of_government.countries, Costa Rica
m.0w8ff8v, government.national_anthem_of_a_country.anthem, Nigeria, We Hail Thee
Gabon, location.country.form_of_government, Presidential system
Presidential system, government.form_of_government.countries, Bolivia
National Anthem, freebase.type_profile.published, Published
Mexico, location.country.form_of_government, Federal republic
Composer, people.profession.corresponding_type, Composer
Presidential system, government.form_of_government.countries, Ecuador
Presidential system, government.form_of_government.countries, Argentina
Lillian Jean Williams, common.topic.notable_for, g.12mk_tmly
Composition, freebase.type_profile.published, Published
Presidential system, government.form_of_government.countries, Guam
Venezuela, location.country.form_of_government, Federal republic
Federal republic, government.form_of_government.countries, United States of America
Presidential system, government.form_of_government.countries, Yemen
m.0w8ff8v, government.national_anthem_of_a_country.country, Nigeria
Musical Recording, freebase.type_profile.published, Published
Uganda, location.country.form_of_government, Presidential system
Chechen Republic of Ichkeria, location.country.form_of_government, Presidential system
Keziah Jones, people.person.nationality, Nigeria
m.07nhchw, base.ontologies.ontology_instance_mapping.freebase_topic, Federal republic
Presidential system, government.form_of_government.countries, Indonesia
Austria, location.country.form_of_government, Federal republic
Switzerland, location.country.form_of_government, Federal republic
Tanzania, location.country.form_of_government, Federal republic
Nigeria We Hail Thee, music.recording.artist, Keziah Jones
Uzbekistan, location.country.form_of_government, Presidential system
Presidential system, government.form_of_government.countries, Federated States of Micronesia
National Anthem, freebase.type_hints.included_types, Topic
Presidential system, government.form_of_government.countries, Ivory Coast
Lyricist, freebase.type_hints.included_types, Topic
Nigeria, We Hail Thee, government.national_anthem.national_anthem_of, m.0w8ff8v
Paraguay, location.country.form_of_government, Presidential system
Presidential system, government.form_of_government.countries, Chad
Presidential system, government.form_of_government.countries, Iran
Federal republic, government.form_of_government.countries, Comoros
National Anthem, freebase.type_profile.kind, Definition
Armenia, location.country.form_of_government, Presidential system
Uruguay, location.country.form_of_government, Presidential system
Presidential system, government.form_of_government.countries, United Arab Emirates
National anthem, freebase.equivalent_topic.equivalent_type, National Anthem
Azerbaijan, location.country.form_of_government, Presidential system
Composition, freebase.type_profile.kind, Definition
Federal republic, government.form_of_government.countries, Bosnia and Herzegovina
Presidential system, government.form_of_government.countries, El Salvador
Musical Recording, freebase.type_profile.strict_included_types, Topic
Presidential system, government.form_of_government.countries, Rwanda
Marshall Islands, location.country.form_of_government, Presidential system
Federal republic, government.form_of_government.countries, Nigeria
Federal republic, government.form_of_government.countries, Germany
Kenya, location.country.form_of_government, Presidential system
Indonesia, location.country.form_of_government, Presidential system
Federal republic, government.form_of_government.countries, Austria
Lillian Jean Williams, people.person.nationality, United Kingdom
Musical Recording, freebase.type_hints.included_types, Topic
Frances Berda, people.person.profession, Composer
Presidential system, government.form_of_government.countries, Cyprus
Nigeria, We Hail Thee, government.national_anthem.national_anthem_of, m.0w8ff8v
Bosnia and Herzegovina, location.country.form_of_government, Federal republic
El Salvador, location.country.form_of_government, Presidential system
Iran, location.country.form_of_government, Presidential system
Presidential system, government.form_of_government.countries, Armenia
Nigeria, government.form_of_government.countries, Presidential system
Socialist Federal Republic of Yugoslavia, location.country.form_of_government, Federal republic
Nigeria, location.country.national_anthem, m.0w8ff8v
m.010vsw91, dataworld.gardening_hint.last_referenced_by, Presidential system
Presidential system, government.form_of_government.countries, Nagorno-Karabakh Republic
Lyricist, freebase.equivalent_topic.equivalent_type, Lyricist
Germany, location.country.form_of_government, Federal republic
Sierra Leone, location.country.form_of_government, Presidential system
Presidential system, government.form_of_government.countries, Eritrea
Federal republic, government.form_of_government.countries, Venezuela
Presidential system, user.avh.default_domain.ellerdale_topic.ellerdale_id, 0080-9549
Lyricist, freebase.type_profile.equivalent_topic, Lyricist
Rwanda, location.country.form_of_government, Presidential system
Republic of Texas, location.country.form_of_government, Presidential system
Costa Rica, location.country.form_of_government, Presidential system
Maldives, location.country.form_of_government, Presidential system
Eritrea, location.country.form_of_government, Presidential system
Somalia, location.country.form_of_government, Federal republic
National Anthem, freebase.type_hints.included_types, Composition
Presidential system, base.schemastaging.context_name.pronunciation, g.125_ql64_
Tajikistan, location.country.form_of_government, Presidential system
Anthem, rdf-schema#range, National Anthem
Nigeria, location.country.form_of_government, Federal republic
Nepal, location.country.form_of_government, Federal republic
Seychelles, location.country.form_of_government, Presidential system
Presidential system, government.form_of_government.countries, South Sudan
Malawi, location.country.form_of_government, Presidential system
Presidential system, government.form_of_government.countries, Azerbaijan
Puntland, location.country.form_of_government, Presidential system
m.0r1g7_q, dataworld.gardening_hint.last_referenced_by, Federal republic
Presidential system, government.form_of_government.countries, Liberia
m.0w8ff8v, government.national_anthem_of_a_country.country, Nigeria
Nigeria, We Hail Thee, common.topic.article, m.0w7q9r3
Nagorno-Karabakh Republic, location.country.form_of_government, Presidential system
Presidential system, government.form_of_government.countries, Republic of Afghanistan
Presidential system, government.form_of_government.countries, Palau
Federal republic, user.avh.default_domain.ellerdale_topic.ellerdale_id, 0080-d81e
Frances Berda, common.topic.notable_types, Composer
Gambia, location.country.form_of_government, Presidential system
Nigeria, We Hail Thee, music.composition.composer, Frances Berda
Presidential system, government.form_of_government.countries, Philippines
United Federations, fictional_universe.fictional_organization.type_of_organization, Federal republic
French Second Republic, location.country.form_of_government, Presidential system
Federal republic, government.form_of_government.countries, Czechoslovak Socialist Republic
Presidential system, government.form_of_government.countries, Turkmenistan
Presidential system, government.form_of_government.countries, Kenya
Nigeria We Hail Thee, music.recording.tracks, Nigeria We Hail Thee
Republic of the Congo, location.country.form_of_government, Presidential system
Peru, location.country.form_of_government, Presidential system
Federal republic, government.form_of_government.countries, Brazil
Presidential system, government.form_of_government.countries, Kazakhstan
Cyprus, location.country.form_of_government, Presidential system
Federal republic, fictional_universe.fictional_organization_type.organizations, United Federations

Answer: Presidential system
Federal republic