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: Which flag is flown by the state which held the 2008 election for United States Senate in Colorado? 
Knowledge Triplets: Colorado, government.governmental_jurisdiction.government_positions, Secretary of State of Colorado
Colorado, common.topic.webpage, m.09x75r8
United States Senate election in Illinois, 2008, government.election.general_election, United States Senate elections, 2008
Colorado, government.political_district.representatives, m.09qpd93
United States Senate election in Montana, 2008, government.election.office, United States Senator
Colorado state elections, 2008, government.general_election.includes_general_elections, United States House of Representatives elections in Colorado, 2008
m.09qpk8s, government.government_position_held.district_represented, Colorado
United States Senate election in Montana, 2008, common.topic.notable_types, Election contest
United States Senate elections, 2008, government.general_election.contests, United States Senate election in Texas, 2008
United States Senate elections, 2010, common.topic.image, Harry Reid official portrait
United States Senate elections, 2008, common.topic.image, Harry Reid official portrait
Colorado, government.political_district.representatives, m.09qpq8g
United States Senate election in Colorado, 2008, government.election.winner, Mark Udall
United States Senate election in Georgia, 2008, government.election.general_election, United States Senate elections, 2008
United States Senate election in Louisiana, 2008, government.election.general_election, United States Senate elections, 2008
Colorado, location.location.containedby, United States of America
m.09x37bx, common.webpage.topic, Colorado
United States Senate elections, 2008, government.general_election.contests, United States Senate election in Rhode Island, 2008
Colorado, government.political_district.elections, United States Senate election in Colorado, 2008
m.0b4717c, common.webpage.topic, Colorado
United States Senate elections, 2008, government.general_election.contests, United States Senate election in Kansas, 2008
United States Senate election in Massachusetts, 2008, government.election.office, United States Senator
United States Senate elections, 2008, government.general_election.contests, United States Senate election in West Virginia, 2008
m.09qpblf, government.government_position_held.district_represented, Colorado
United States Senate election in Texas, 2008, common.topic.notable_types, Election contest
m.09qpjp_, government.government_position_held.district_represented, Colorado
United States Senate elections, 2006, common.topic.notable_types, Election contest
m.09x6dx8, common.webpage.topic, Colorado
Colorado, book.book_subject.works, Plainsong
United States Senate elections, 2008, government.general_election.contests, United States Senate election in Virginia, 2008
m.0116362w, government.government_position_held.governmental_body, Colorado General Assembly
Colorado, common.topic.article, m.01n55
Colorado state elections, 2008, government.general_election.includes_general_elections, Colorado House of Representatives elections, 2008
Colorado, government.political_district.representatives, m.09qpdz3
United States Senate election in Alaska, 2008, government.election.office, United States Senator
Colorado, book.book_subject.works, Found money
Colorado, common.topic.image, National-atlas-colorado
United States Senate election in Colorado, 2008, common.topic.article, m.027phsx
m.09qpj0b, government.government_position_held.district_represented, Colorado
Colorado, symbols.flag_referent.flag, m.0jspjkw
Colorado, government.governmental_jurisdiction.official_symbols, m.04st83d
Colorado, government.political_district.representatives, m.09qpj0b
m.02_wy4l, government.government_position_held.district_represented, Colorado
Colorado, book.book_subject.works, The Spring
Colorado, government.political_district.representatives, m.09qpfy6
United States Senate election in Kentucky, 2008, government.election.office, United States Senator
United States elections, 2008, government.general_election.includes_general_elections, Colorado state elections, 2008
Secretary of State of Colorado, government.government_office_or_title.office_holders, m.010f0mcq
United States Senate election in New Jersey, 2008, government.election.office, United States Senator
m.09qppf9, government.government_position_held.district_represented, Colorado
United States Senate elections, 2008, government.general_election.contests, United States Senate election in Montana, 2008
United States Senate election in Illinois, 2008, government.election.office, United States Senator
United States Senate elections, 2008, government.general_election.contests, United States Senate election in Alabama, 2008
Colorado state elections, 2008, government.general_election.contests, United States Senate election in Colorado, 2008
United States Senate elections, 2008, government.general_election.contests, United States Senate election in Iowa, 2008
Colorado, government.governmental_jurisdiction.governing_officials, m.04krcsg
United States Senate elections, 2010, time.event.previous_in_series, United States Senate elections, 2008
Colorado, government.political_district.representatives, m.09qphlq
m.09x4jbd, common.webpage.topic, Colorado
Colorado, government.governmental_jurisdiction.governing_officials, m.0116362w
Colorado, government.governmental_jurisdiction.governing_officials, m.04krct6
m.09qpc0p, government.government_position_held.district_represented, Colorado
United States Senate election in Illinois, 2008, common.topic.notable_types, Election contest
Colorado, book.book_subject.works, Atticus
m.09ys6rr, common.webpage.topic, Colorado
m.09qpj87, government.government_position_held.district_represented, Colorado
United States Senate election in Colorado, 2008, common.topic.notable_types, Election contest
Colorado, book.book_subject.works, Black silk handkerchief
Colorado, government.governmental_jurisdiction.governing_officials, m.04krcsv
m.09qph80, government.government_position_held.district_represented, Colorado
Colorado, government.political_district.representatives, m.09qplwr
Colorado, book.book_subject.works, Double shot
United States Senate elections, 2008, base.newsevents.news_reported_event.news_report_s, m.07wwnf8
Colorado, government.governmental_jurisdiction.official_symbols, m.0hz8x9r
Colorado, common.topic.webpage, m.0b47jr4
Colorado state elections, 2008, government.general_election.includes_general_elections, Colorado State Senate elections, 2008
United States Senate elections, 2008, time.event.instance_of_recurring_event, United States Senate election
Colorado, government.political_district.representatives, m.09qpfbx
Colorado, location.location.containedby, Contiguous United States
United States Senate elections, 2008, government.general_election.contests, United States Senate election in South Dakota, 2008
United States Senate elections, 2008, time.event.next_in_series, United States Senate elections, 2010
United States Senate elections, 2008, government.general_election.contests, United States Senate election in New Jersey, 2008
United States of America, base.aareas.schema.administrative_area.administrative_children, Colorado
Colorado, common.topic.webpage, m.09y9d9t
Colorado, common.topic.webpage, m.09wjfjg
United States Senate election in Kentucky, 2008, common.topic.notable_types, Election contest
Colorado, common.topic.image, Colorado.png
United States Senate election in Colorado, 2008, common.topic.notable_for, g.1258mvlgz
Colorado, government.political_district.representatives, m.09qpcz7
United States Senate election in Oregon, 2008, government.election.office, United States Senator
United States Senate elections, 2008, government.general_election.contests, United States Senate election in Alaska, 2008
Colorado, common.topic.webpage, m.09y73nf
United States Senate election in Tennessee, 2008, common.topic.notable_types, Election contest
Colorado, government.political_district.representatives, m.09qpcbn
United States Senate election in Georgia, 2008, government.election.office, United States Senator
m.09qpcz7, government.government_position_held.district_represented, Colorado
m.09qpl1y, government.government_position_held.district_represented, Colorado
United States Senate elections, 2008, government.general_election.contests, United States Senate election in Tennessee, 2008
United States Senate election in Alaska, 2008, government.election.general_election, United States Senate elections, 2008
Colorado, government.governmental_jurisdiction.governing_officials, m.01148yhn
m.0jspjkw, symbols.flag_use.flag, Flag of Colorado
United States Senate election in Alabama, 2008, common.topic.notable_types, Election contest
Secretary of State of Colorado, common.topic.notable_types, Government Office or Title
United States Senate election in Michigan, 2008, common.topic.notable_types, Election contest
Colorado, government.political_district.representatives, m.09qpm93
Colorado, book.written_work.subjects, Colorado
Colorado, government.governmental_jurisdiction.official_symbols, m.04str9v
Colorado state elections, 2008, government.general_election.part_of_general_election, United States elections, 2008
United States Senate election in Massachusetts, 2008, government.election.general_election, United States Senate elections, 2008
m.09qprsc, government.government_position_held.district_represented, Colorado
Colorado, government.political_district.representatives, m.09qpkmw
United States Senate elections, 2008, government.general_election.contests, United States Senate election in Delaware, 2008
Colorado, common.topic.webpage, m.09wjbs0
m.09qpkmw, government.government_position_held.district_represented, Colorado
United States Senate election in Iowa, 2008, government.election.office, United States Senator
United States Senate election in Colorado, 2008, government.political_district.elections, Colorado
Colorado, book.book_subject.works, Redeye
United States Senate elections, 2010, common.topic.notable_types, General election
United States Senate election in Colorado, 2008, government.election.general_election, United States Senate elections, 2008
United States Senate elections, 2008, common.topic.notable_types, General election
Colorado, book.book_subject.works, Blue Mountain
United States Senate elections, 2006, time.event.next_in_series, United States Senate elections, 2008
United States Senate election in Tennessee, 2008, government.election.general_election, United States Senate elections, 2008
United States Senate election in Texas, 2008, government.election.general_election, United States Senate elections, 2008
Colorado, government.political_district.representatives, m.09qpnl3
Colorado, base.biblioness.bibs_location.country, United States of America
United States Senate election in Kentucky, 2008, government.election.general_election, United States Senate elections, 2008
Colorado, government.political_district.representatives, m.09qpmph
United States Senate election in Michigan, 2008, government.election.general_election, United States Senate elections, 2008
m.0jspjkw, symbols.flag_use.flag_user, Colorado
United States of America, location.country.first_level_divisions, Colorado
m.09qpmph, government.government_position_held.district_represented, Colorado
United States Senate elections, 2008, common.topic.notable_for, g.125804hj9
Colorado, government.political_district.representatives, m.05kfbwl
United States Senate election in Oregon, 2008, common.topic.notable_types, Election contest
United States Senate election in Alabama, 2008, government.election.office, United States Senator
United States Senate election in Colorado, 2008, common.topic.image, Mark Udall
Colorado, government.political_district.representatives, m.02_wstr
Colorado, book.book_subject.works, Tallgrass
United States Senate election in Colorado, 2008, government.election.office, United States Senator
Colorado, government.governmental_jurisdiction.governing_officials, m.052m16l
United States Senate elections, 2008, common.topic.image, Senate Seats up for election:██ Republican incumbent██ Retiring Republican██ Democratic incumbent██ No election
Colorado, common.topic.webpage, m.09xzb4d
United States Senate elections, 2008, government.general_election.contests, United States Senate election in Minnesota, 2008
United States Senate election in Iowa, 2008, common.topic.notable_types, Election contest
United States Senate elections, 2008, government.general_election.contests, United States Senate election in Illinois, 2008
Colorado, government.political_district.representatives, m.09qpdp3
Colorado, government.political_district.representatives, m.09qph80
United States Senate election in Nebraska, 2008, government.election.general_election, United States Senate elections, 2008
United States Senate elections, 2008, government.general_election.contests, United States Senate election in North Carolina, 2008
United States Senate election in Michigan, 2008, government.election.office, United States Senator
Colorado, common.topic.webpage, m.09ymzbp
United States Senate election in New Mexico, 2008, government.election.office, United States Senator
United States Senate elections, 2008, government.general_election.contests, United States Senate election in Arkansas, 2008
Colorado, government.political_district.representatives, m.09qpj87
United States Senate election in Alaska, 2008, common.topic.notable_types, Election contest
m.09qpb7n, government.government_position_held.district_represented, Colorado
United States Senate election in Massachusetts, 2008, common.topic.notable_types, Election contest
United States Senate elections, 2008, common.topic.article, m.04958v
Colorado, common.topic.webpage, m.0b4717c
United States of America, base.locations.countries.states_provinces_within, Colorado
Colorado, government.political_district.representatives, m.09qpjp_
m.09ymzbp, common.webpage.topic, Colorado
Colorado, government.political_district.representatives, m.09qprsc
Colorado, common.topic.webpage, m.04lssp_
Colorado, government.governmental_jurisdiction.governing_officials, m.04krcqz
Colorado, book.book_subject.works, Dreamwalker
Colorado, common.topic.webpage, m.09xwmmb
m.09qpfy6, government.government_position_held.district_represented, Colorado
Colorado, government.political_district.representatives, m.09qpp0t
United States Senate elections, 2008, government.general_election.contests, United States Senate election in Colorado, 2008
United States Senate election in Kansas, 2008, government.election.general_election, United States Senate elections, 2008
United States Senate election in Oregon, 2008, government.election.general_election, United States Senate elections, 2008
United States Senate elections, 2008, government.general_election.contests, United States Senate election in New Hampshire, 2008
United States Senate election in Colorado, 2010, common.topic.notable_types, Election contest
m.09y73nf, common.webpage.topic, Colorado
Colorado, common.topic.article, m.02h9c27
Colorado, government.governmental_jurisdiction.governing_officials, m.04krcr6
United States Senate election in New Jersey, 2008, government.election.general_election, United States Senate elections, 2008
Colorado, government.governmental_jurisdiction.official_symbols, m.0jbdlj8
Colorado State Patrol, government.government_agency.jurisdiction, Colorado
Colorado, common.topic.webpage, m.09y7j64
United States Senate election in Colorado, 2008, government.election.district, Colorado
United States Senate election in Louisiana, 2008, government.election.office, United States Senator
m.09qpcmr, government.government_position_held.district_represented, Colorado
Colorado, book.book_subject.works, Zeph
m.09qpn2q, government.government_position_held.district_represented, Colorado
Flag of Colorado, symbols.flag.used_by, m.0jspjkw
United States Senate elections, 2010, time.event.instance_of_recurring_event, United States Senate election
Colorado, common.topic.webpage, m.09ym1f_
Colorado, book.written_work.subjects, United States of America
m.09qpgzn, government.government_position_held.district_represented, Colorado
United States Senate elections, 2008, government.general_election.contests, United States Senate election in Massachusetts, 2008
United States Senate elections, 2008, time.event.previous_in_series, United States Senate elections, 2006
Colorado, book.book_subject.works, Nothing to Lose
United States Senate election in New Mexico, 2008, government.election.general_election, United States Senate elections, 2008
600px-Senate_Seal.svg.png, common.image.appears_in_topic_gallery, United States Senate
Colorado, book.book_subject.works, The Lake House
m.0b47jr4, common.webpage.topic, Colorado
United States Senate election in New Jersey, 2008, common.topic.notable_types, Election contest
United States Senator, common.topic.image, 600px-Senate_Seal.svg.png
m.010f0mcq, government.government_position_held.office_position_or_title, Secretary of State of Colorado
m.09x62z9, common.webpage.topic, Colorado
Colorado, government.governmental_jurisdiction.governing_officials, m.04krcr2
Colorado, book.book_subject.works, First impressions
United States Senate election in Tennessee, 2008, government.election.office, United States Senator
Colorado, government.governmental_jurisdiction.agencies, Colorado State Patrol
Colorado, government.political_district.representatives, m.09qpl1y
Colorado, government.governmental_jurisdiction.governing_officials, m.010f0mms
United States Senate elections, 2008, government.general_election.contests, United States Senate election in Oklahoma, 2008
Colorado, government.governmental_jurisdiction.official_symbols, m.04l0cxy
m.09xwmmb, common.webpage.topic, Colorado
Colorado, government.political_district.representatives, m.09qpj_s
United States Senate elections, 2008, government.general_election.contests, United States Senate election in Louisiana, 2008
Colorado, common.topic.webpage, m.0b6s0lm
Colorado.png, common.image.appears_in_topic_gallery, Colorado
United States Senate elections, 2006, common.topic.image, Harry Reid official portrait
United States Senate, common.topic.image, 600px-Senate_Seal.svg.png
United States Senate election in Louisiana, 2008, common.topic.notable_types, Election contest
m.09wfzmy, common.webpage.topic, Colorado
United States elections, 2008, government.general_election.includes_general_elections, United States Senate elections, 2008
United States Senate election in Texas, 2008, government.election.office, United States Senator
Colorado, government.political_district.representatives, m.09qpcmr
Colorado, government.governmental_jurisdiction.governing_officials, m.011lqkng
United States Senate elections, 2008, government.general_election.contests, United States Senate election in Georgia, 2008
United States Senate election in Nebraska, 2008, government.election.office, United States Senator
Colorado, symbols.flag_use.flag_user, m.0jspjkw
United States Senate elections, 2008, common.topic.image, Harry Reid official portrait 2009
United States Senate elections, 2008, government.general_election.includes_general_elections, United States Senate election in Mississippi, 2008
m.09qpfbx, government.government_position_held.district_represented, Colorado
United States Senate election in Alabama, 2008, government.election.general_election, United States Senate elections, 2008
Colorado, government.governmental_jurisdiction.governing_officials, m.01166cpz
Colorado, government.governmental_jurisdiction.governing_officials, m.04krcrz
m.05kh0nn, government.government_position_held.district_represented, Colorado
United States Senate elections, 2008, government.general_election.includes_general_elections, United States Senate election in Wyoming, 2008
United States Senate elections, 2008, government.general_election.contests, United States Senate election in New Mexico, 2008
Colorado, government.political_district.representatives, m.09qpljc
Colorado, common.topic.webpage, m.09x4gp3
United States of America, location.country.administrative_divisions, Colorado
Colorado, common.topic.webpage, m.09x6dx8
United States Senate election in Iowa, 2008, government.election.general_election, United States Senate elections, 2008
Colorado, government.political_district.representatives, m.05kh0nn
m.09y9d9t, common.webpage.topic, Colorado
Colorado, location.administrative_division.country, United States of America
Colorado, government.political_district.representatives, m.09qppf9
Colorado, book.book_subject.works, Colorado
Colorado, location.us_state.capital, Denver
United States elections, 2008, time.event.locations, United States of America
United States Senate elections, 2008, government.general_election.contests, United States Senate election in Oregon, 2008
m.09wjfjg, common.webpage.topic, Colorado
m.09qpj_s, government.government_position_held.district_represented, Colorado
m.09qpm93, government.government_position_held.district_represented, Colorado
Colorado, common.topic.webpage, m.09x32b8
m.09y7j64, common.webpage.topic, Colorado
m.09qpqjx, government.government_position_held.district_represented, Colorado
Secretary of State of Colorado, government.government_office_or_title.office_holders, m.0hz6xmv
m.09qpq8g, government.government_position_held.district_represented, Colorado
Colorado, common.topic.webpage, m.09ys6rr
m.09x75r8, common.webpage.topic, Colorado
Colorado, government.political_district.representatives, m.09qpb7n
Colorado, book.book_subject.works, Legend
United States Senate elections, 2006, time.event.instance_of_recurring_event, United States Senate election
United States Senate elections, 2006, common.topic.image, Harry Reid official portrait 2009
m.09x32b8, common.webpage.topic, Colorado
Colorado, common.topic.notable_for, g.125c79s4m
United States Senate elections, 2008, government.general_election.part_of_general_election, United States elections, 2008
United States Senate elections, 2010, government.general_election.contests, United States Senate election in Colorado, 2010
m.09qpg7j, government.government_position_held.district_represented, Colorado
Colorado, book.book_subject.works, Iced
Colorado, book.book_subject.works, Beany Malone
United States Senate election in Colorado, 2008, government.election.general_election, Colorado state elections, 2008
Colorado, government.political_district.elections, United States Senate election in Colorado, 2010
Mark Udall, common.image.appears_in_topic_gallery, United States Senate election in Colorado, 2008
Colorado, government.political_district.representatives, m.09qpc0p
Colorado, symbols.name_source.namesakes, USS Colorado (ACR-7)
Colorado, common.topic.webpage, m.09wfzmy
United States Senate election in Kansas, 2008, government.election.office, United States Senator
Colorado, common.topic.webpage, m.09x37bx
United States Senate election in Virginia, 2008, common.topic.notable_types, Election contest
Colorado, book.book_subject.works, Hard truth
Colorado, government.political_district.representatives, m.09qpqjx
United States Senate elections, 2008, government.general_election.contests, United States Senate election in South Carolina, 2008
National-atlas-colorado, common.image.appears_in_topic_gallery, Colorado
Colorado, common.topic.webpage, m.0gmk36f
Colorado, government.governmental_jurisdiction.official_symbols, m.0hzd89p
Secretary of State of Colorado, government.government_office_or_title.jurisdiction, Colorado
Colorado, government.governmental_jurisdiction.official_symbols, m.04stk7q
m.07wwnf8, base.newsevents.news_report.event, United States Senate elections, 2008
Colorado, book.book_subject.works, Eventide
Colorado, government.political_district.representatives, m.09qpg7j
m.0b6s0lm, common.webpage.topic, Colorado
United States Senate, government.governmental_body.jurisdiction, United States of America
m.09qphlq, government.government_position_held.district_represented, Colorado
m.09qpnl3, government.government_position_held.district_represented, Colorado
Colorado, government.governmental_jurisdiction.governing_officials, m.04krcs6
m.09wjbs0, common.webpage.topic, Colorado
Colorado state elections, 2008, common.topic.notable_types, General election
United States Senate election in Montana, 2008, government.election.general_election, United States Senate elections, 2008
Colorado, base.locations.states_and_provences.country, United States of America
United States Senate election in Colorado, 2010, government.election.general_election, United States Senate elections, 2010
Colorado, government.political_district.representatives, m.09qpn2q
m.09qpcbn, government.government_position_held.district_represented, Colorado
Colorado, government.governmental_jurisdiction.governing_officials, m.04krcs2
United States Senate elections, 2008, government.general_election.contests, United States Senate election in Nebraska, 2008
Colorado State Patrol, organization.organization.place_founded, Colorado
United States elections, 2008, common.topic.notable_types, General election
Colorado, government.governmental_jurisdiction.governing_officials, m.04krcsz
United States Senate election in Nebraska, 2008, common.topic.notable_types, Election contest
m.05kfbwl, government.government_position_held.district_represented, Colorado
United States Senate election in Colorado, 2010, government.election.district, Colorado
m.09ym1f_, common.webpage.topic, Colorado
United States Senate election in Colorado, 2010, government.election.office, United States Senator
United States Senator, common.topic.notable_for, g.1259lv35m
United States Senate election in Virginia, 2008, government.election.general_election, United States Senate elections, 2008
United States Senate elections, 2008, government.general_election.contests, United States Senate election in Idaho, 2008
United States Senate election in New Mexico, 2008, common.topic.notable_types, Election contest
Colorado, government.governmental_jurisdiction.governing_officials, m.04krcw6
m.0hz6xmv, government.government_position_held.office_position_or_title, Secretary of State of Colorado
Colorado, book.book_subject.works, Prime cut
m.0jspjkw, symbols.flag_use.flag, Flag of Colorado
m.09x4gp3, common.webpage.topic, Colorado
Colorado state elections, 2008, common.topic.notable_for, g.12550b38p
Colorado, common.topic.notable_types, US State
United States Senate election in Kansas, 2008, common.topic.notable_types, Election contest
Colorado, symbols.name_source.namesakes, USS Colorado (BB-45)
United States Senate elections, 2008, government.general_election.contests, United States Senate election in Kentucky, 2008
Colorado, common.topic.webpage, m.09x62z9
Contiguous United States, location.location.contains, Colorado
Colorado, government.political_district.representatives, m.09qpk8s
United States Senate election in Georgia, 2008, common.topic.notable_types, Election contest
Colorado, location.administrative_division.first_level_division_of, United States of America
Colorado, government.governmental_jurisdiction.official_symbols, m.04stpyy
Colorado, book.book_subject.works, Perfect
Colorado, government.political_district.representatives, m.02_wy4l
m.04lssp_, common.webpage.topic, Colorado
United States Senate elections, 2008, government.general_election.contests, United States Senate election in Maine, 2008
Colorado, common.topic.webpage, m.09x4jbd
Colorado, government.governmental_jurisdiction.governing_officials, m.04krcsb
m.09xzb4d, common.webpage.topic, Colorado
United States Senate elections, 2008, government.general_election.contests, United States Senate election in Michigan, 2008
m.09qpp0t, government.government_position_held.district_represented, Colorado
Colorado, government.governmental_jurisdiction.governing_officials, m.04krcv6
United States Senate election in Virginia, 2008, government.election.office, United States Senator
m.0gmk36f, common.webpage.topic, Colorado
Colorado, government.political_district.representatives, m.09qpblf
Colorado, government.political_district.representatives, m.09qpgzn

Answer: Flag of Colorado