1 Ureido Methacrylate Market Overview
1.1 Product Definition
1.2 Ureido Methacrylate Segment by Type
1.2.1 Global Ureido Methacrylate Market Value Growth Rate Analysis by Type 2022 VS 2029
1.2.2 25% Purity
1.2.3 50% Purity
1.3 Ureido Methacrylate Segment by Application
1.3.1 Global Ureido Methacrylate Market Value Growth Rate Analysis by Application: 2022 VS 2029
1.3.2 Architectural Coatings
1.3.3 Adhesives
1.3.4 Textile & Leather
1.4 Global Market Growth Prospects
1.4.1 Global Ureido Methacrylate Production Value Estimates and Forecasts (2020-2031)
1.4.2 Global Ureido Methacrylate Production Capacity Estimates and Forecasts (2020-2031)
1.4.3 Global Ureido Methacrylate Production Estimates and Forecasts (2020-2031)
1.4.4 Global Ureido Methacrylate Market Average Price Estimates and Forecasts (2020-2031)
1.5 Assumptions and Limitations
2 Market Competition by Manufacturers
2.1 Global Ureido Methacrylate Production Market Share by Manufacturers (2020-2025)
2.2 Global Ureido Methacrylate Production Value Market Share by Manufacturers (2020-2025)
2.3 Global Key Players of Ureido Methacrylate, Industry Ranking, 2023 VS 2024 VS 2025
2.4 Global Ureido Methacrylate Market Share by Company Type (Tier 1, Tier 2 and Tier 3)
2.5 Global Ureido Methacrylate Average Price by Manufacturers (2020-2025)
2.6 Global Key Manufacturers of Ureido Methacrylate, Manufacturing Base Distribution and Headquarters
2.7 Global Key Manufacturers of Ureido Methacrylate, Product Offered and Application
2.8 Global Key Manufacturers of Ureido Methacrylate, Date of Enter into This Industry
2.9 Ureido Methacrylate Market Competitive Situation and Trends
2.9.1 Ureido Methacrylate Market Concentration Rate
2.9.2 Global 5 and 10 Largest Ureido Methacrylate Players Market Share by Revenue
2.10 Mergers & Acquisitions, Expansion
3 Ureido Methacrylate Production by Region
3.1 Global Ureido Methacrylate Production Value Estimates and Forecasts by Region: 2020 VS 2024 VS 2031
3.2 Global Ureido Methacrylate Production Value by Region (2020-2031)
3.2.1 Global Ureido Methacrylate Production Value Market Share by Region (2020-2025)
3.2.2 Global Forecasted Production Value of Ureido Methacrylate by Region (2026-2031)
3.3 Global Ureido Methacrylate Production Estimates and Forecasts by Region: 2020 VS 2024 VS 2031
3.4 Global Ureido Methacrylate Production by Region (2020-2031)
3.4.1 Global Ureido Methacrylate Production Market Share by Region (2020-2025)
3.4.2 Global Forecasted Production of Ureido Methacrylate by Region (2026-2031)
3.5 Global Ureido Methacrylate Market Price Analysis by Region (2020-2025)
3.6 Global Ureido Methacrylate Production and Value, Year-over-Year Growth
3.6.1 North America Ureido Methacrylate Production Value Estimates and Forecasts (2020-2031)
3.6.2 Europe Ureido Methacrylate Production Value Estimates and Forecasts (2020-2031)
3.6.3 China Ureido Methacrylate Production Value Estimates and Forecasts (2020-2031)
3.6.4 Japan Ureido Methacrylate Production Value Estimates and Forecasts (2020-2031)
4 Ureido Methacrylate Consumption by Region
4.1 Global Ureido Methacrylate Consumption Estimates and Forecasts by Region: 2020 VS 2024 VS 2031
4.2 Global Ureido Methacrylate Consumption by Region (2020-2031)
4.2.1 Global Ureido Methacrylate Consumption by Region (2020-2025)
4.2.2 Global Ureido Methacrylate Forecasted Consumption by Region (2026-2031)
4.3 North America
4.3.1 North America Ureido Methacrylate Consumption Growth Rate by Country: 2020 VS 2024 VS 2031
4.3.2 North America Ureido Methacrylate Consumption by Country (2020-2031)
4.3.3 United States
4.3.4 Canada
4.4 Europe
4.4.1 Europe Ureido Methacrylate Consumption Growth Rate by Country: 2020 VS 2024 VS 2031
4.4.2 Europe Ureido Methacrylate Consumption by Country (2020-2031)
4.4.3 Germany
4.4.4 France
4.4.5 U.K.
4.4.6 Italy
4.4.7 Russia
4.5 Asia Pacific
4.5.1 Asia Pacific Ureido Methacrylate Consumption Growth Rate by Region: 2020 VS 2024 VS 2031
4.5.2 Asia Pacific Ureido Methacrylate Consumption by Region (2020-2031)
4.5.3 China
4.5.4 Japan
4.5.5 South Korea
4.5.6 China Taiwan
4.5.7 Southeast Asia
4.5.8 India
4.6 Latin America, Middle East & Africa
4.6.1 Latin America, Middle East & Africa Ureido Methacrylate Consumption Growth Rate by Country: 2020 VS 2024 VS 2031
4.6.2 Latin America, Middle East & Africa Ureido Methacrylate Consumption by Country (2020-2031)
4.6.3 Mexico
4.6.4 Brazil
4.6.5 Turkey
5 Segment by Type
5.1 Global Ureido Methacrylate Production by Type (2020-2031)
5.1.1 Global Ureido Methacrylate Production by Type (2020-2025)
5.1.2 Global Ureido Methacrylate Production by Type (2026-2031)
5.1.3 Global Ureido Methacrylate Production Market Share by Type (2020-2031)
5.2 Global Ureido Methacrylate Production Value by Type (2020-2031)
5.2.1 Global Ureido Methacrylate Production Value by Type (2020-2025)
5.2.2 Global Ureido Methacrylate Production Value by Type (2026-2031)
5.2.3 Global Ureido Methacrylate Production Value Market Share by Type (2020-2031)
5.3 Global Ureido Methacrylate Price by Type (2020-2031)
6 Segment by Application
6.1 Global Ureido Methacrylate Production by Application (2020-2031)
6.1.1 Global Ureido Methacrylate Production by Application (2020-2025)
6.1.2 Global Ureido Methacrylate Production by Application (2026-2031)
6.1.3 Global Ureido Methacrylate Production Market Share by Application (2020-2031)
6.2 Global Ureido Methacrylate Production Value by Application (2020-2031)
6.2.1 Global Ureido Methacrylate Production Value by Application (2020-2025)
6.2.2 Global Ureido Methacrylate Production Value by Application (2026-2031)
6.2.3 Global Ureido Methacrylate Production Value Market Share by Application (2020-2031)
6.3 Global Ureido Methacrylate Price by Application (2020-2031)
7 Key Companies Profiled
7.1 BASF
7.1.1 BASF Ureido Methacrylate Corporation Information
7.1.2 BASF Ureido Methacrylate Product Portfolio
7.1.3 BASF Ureido Methacrylate Production, Value, Price and Gross Margin (2020-2025)
7.1.4 BASF Main Business and Markets Served
7.1.5 BASF Recent Developments/Updates
7.2 Evonik
7.2.1 Evonik Ureido Methacrylate Corporation Information
7.2.2 Evonik Ureido Methacrylate Product Portfolio
7.2.3 Evonik Ureido Methacrylate Production, Value, Price and Gross Margin (2020-2025)
7.2.4 Evonik Main Business and Markets Served
7.2.5 Evonik Recent Developments/Updates
8 Industry Chain and Sales Channels Analysis
8.1 Ureido Methacrylate Industry Chain Analysis
8.2 Ureido Methacrylate Key Raw Materials
8.2.1 Key Raw Materials
8.2.2 Raw Materials Key Suppliers
8.3 Ureido Methacrylate Production Mode & Process
8.4 Ureido Methacrylate Sales and Marketing
8.4.1 Ureido Methacrylate Sales Channels
8.4.2 Ureido Methacrylate Distributors
8.5 Ureido Methacrylate Customers
9 Ureido Methacrylate Market Dynamics
9.1 Ureido Methacrylate Industry Trends
9.2 Ureido Methacrylate Market Drivers
9.3 Ureido Methacrylate Market Challenges
9.4 Ureido Methacrylate Market Restraints
10 Research Finding and Conclusion
11 Methodology and Data Source
11.1 Methodology/Research Approach
11.1.1 Research Programs/Design
11.1.2 Market Size Estimation
11.1.3 Market Breakdown and Data Triangulation
11.2 Data Source
11.2.1 Secondary Sources
11.2.2 Primary Sources
11.3 Author List
11.4 Disclaimer
Table 1. Global Ureido Methacrylate Market Value by Type, (US$ Million) & (2022 VS 2029)
Table 2. Global Ureido Methacrylate Market Value by Application, (US$ Million) & (2022 VS 2029)
Table 3. Global Ureido Methacrylate Production Capacity (Kiloton) by Manufacturers in 2024
Table 4. Global Ureido Methacrylate Production by Manufacturers (2020-2025) & (Kiloton)
Table 5. Global Ureido Methacrylate Production Market Share by Manufacturers (2020-2025)
Table 6. Global Ureido Methacrylate Production Value by Manufacturers (2020-2025) & (US$ Million)
Table 7. Global Ureido Methacrylate Production Value Share by Manufacturers (2020-2025)
Table 8. Global Ureido Methacrylate Industry Ranking 2023 VS 2024 VS 2025
Table 9. Company Type (Tier 1, Tier 2 and Tier 3) & (based on the Revenue in Ureido Methacrylate as of 2022)
Table 10. Global Market Ureido Methacrylate Average Price by Manufacturers (US$/Ton) & (2020-2025)
Table 11. Manufacturers Ureido Methacrylate Production Sites and Area Served
Table 12. Manufacturers Ureido Methacrylate Product Types
Table 13. Global Ureido Methacrylate Manufacturers Market Concentration Ratio (CR5 and HHI)
Table 14. Mergers & Acquisitions, Expansion
Table 15. Global Ureido Methacrylate Production Value by Region: 2020 VS 2024 VS 2031 (US$ Million)
Table 16. Global Ureido Methacrylate Production Value (US$ Million) by Region (2020-2025)
Table 17. Global Ureido Methacrylate Production Value Market Share by Region (2020-2025)
Table 18. Global Ureido Methacrylate Production Value (US$ Million) Forecast by Region (2026-2031)
Table 19. Global Ureido Methacrylate Production Value Market Share Forecast by Region (2026-2031)
Table 20. Global Ureido Methacrylate Production Comparison by Region: 2020 VS 2024 VS 2031 (Kiloton)
Table 21. Global Ureido Methacrylate Production (Kiloton) by Region (2020-2025)
Table 22. Global Ureido Methacrylate Production Market Share by Region (2020-2025)
Table 23. Global Ureido Methacrylate Production (Kiloton) Forecast by Region (2026-2031)
Table 24. Global Ureido Methacrylate Production Market Share Forecast by Region (2026-2031)
Table 25. Global Ureido Methacrylate Market Average Price (US$/Ton) by Region (2020-2025)
Table 26. Global Ureido Methacrylate Market Average Price (US$/Ton) by Region (2026-2031)
Table 27. Global Ureido Methacrylate Consumption Growth Rate by Region: 2020 VS 2024 VS 2031 (Kiloton)
Table 28. Global Ureido Methacrylate Consumption by Region (2020-2025) & (Kiloton)
Table 29. Global Ureido Methacrylate Consumption Market Share by Region (2020-2025)
Table 30. Global Ureido Methacrylate Forecasted Consumption by Region (2026-2031) & (Kiloton)
Table 31. Global Ureido Methacrylate Forecasted Consumption Market Share by Region (2020-2025)
Table 32. North America Ureido Methacrylate Consumption Growth Rate by Country: 2020 VS 2024 VS 2031 (Kiloton)
Table 33. North America Ureido Methacrylate Consumption by Country (2020-2025) & (Kiloton)
Table 34. North America Ureido Methacrylate Consumption by Country (2026-2031) & (Kiloton)
Table 35. Europe Ureido Methacrylate Consumption Growth Rate by Country: 2020 VS 2024 VS 2031 (Kiloton)
Table 36. Europe Ureido Methacrylate Consumption by Country (2020-2025) & (Kiloton)
Table 37. Europe Ureido Methacrylate Consumption by Country (2026-2031) & (Kiloton)
Table 38. Asia Pacific Ureido Methacrylate Consumption Growth Rate by Region: 2020 VS 2024 VS 2031 (Kiloton)
Table 39. Asia Pacific Ureido Methacrylate Consumption by Region (2020-2025) & (Kiloton)
Table 40. Asia Pacific Ureido Methacrylate Consumption by Region (2026-2031) & (Kiloton)
Table 41. Latin America, Middle East & Africa Ureido Methacrylate Consumption Growth Rate by Country: 2020 VS 2024 VS 2031 (Kiloton)
Table 42. Latin America, Middle East & Africa Ureido Methacrylate Consumption by Country (2020-2025) & (Kiloton)
Table 43. Latin America, Middle East & Africa Ureido Methacrylate Consumption by Country (2026-2031) & (Kiloton)
Table 44. Global Ureido Methacrylate Production (Kiloton) by Type (2020-2025)
Table 45. Global Ureido Methacrylate Production (Kiloton) by Type (2026-2031)
Table 46. Global Ureido Methacrylate Production Market Share by Type (2020-2025)
Table 47. Global Ureido Methacrylate Production Market Share by Type (2026-2031)
Table 48. Global Ureido Methacrylate Production Value (US$ Million) by Type (2020-2025)
Table 49. Global Ureido Methacrylate Production Value (US$ Million) by Type (2026-2031)
Table 50. Global Ureido Methacrylate Production Value Share by Type (2020-2025)
Table 51. Global Ureido Methacrylate Production Value Share by Type (2026-2031)
Table 52. Global Ureido Methacrylate Price (US$/Ton) by Type (2020-2025)
Table 53. Global Ureido Methacrylate Price (US$/Ton) by Type (2026-2031)
Table 54. Global Ureido Methacrylate Production (Kiloton) by Application (2020-2025)
Table 55. Global Ureido Methacrylate Production (Kiloton) by Application (2026-2031)
Table 56. Global Ureido Methacrylate Production Market Share by Application (2020-2025)
Table 57. Global Ureido Methacrylate Production Market Share by Application (2026-2031)
Table 58. Global Ureido Methacrylate Production Value (US$ Million) by Application (2020-2025)
Table 59. Global Ureido Methacrylate Production Value (US$ Million) by Application (2026-2031)
Table 60. Global Ureido Methacrylate Production Value Share by Application (2020-2025)
Table 61. Global Ureido Methacrylate Production Value Share by Application (2026-2031)
Table 62. Global Ureido Methacrylate Price (US$/Ton) by Application (2020-2025)
Table 63. Global Ureido Methacrylate Price (US$/Ton) by Application (2026-2031)
Table 64. BASF Ureido Methacrylate Corporation Information
Table 65. BASF Specification and Application
Table 66. BASF Ureido Methacrylate Production (Kiloton), Value (US$ Million), Price (US$/Ton) and Gross Margin (2020-2025)
Table 67. BASF Main Business and Markets Served
Table 68. BASF Recent Developments/Updates
Table 69. Evonik Ureido Methacrylate Corporation Information
Table 70. Evonik Specification and Application
Table 71. Evonik Ureido Methacrylate Production (Kiloton), Value (US$ Million), Price (US$/Ton) and Gross Margin (2020-2025)
Table 72. Evonik Main Business and Markets Served
Table 73. Evonik Recent Developments/Updates
Table 74. Key Raw Materials Lists
Table 75. Raw Materials Key Suppliers Lists
Table 76. Ureido Methacrylate Distributors List
Table 77. Ureido Methacrylate Customers List
Table 78. Ureido Methacrylate Market Trends
Table 79. Ureido Methacrylate Market Drivers
Table 80. Ureido Methacrylate Market Challenges
Table 81. Ureido Methacrylate Market Restraints
Table 82. Research Programs/Design for This Report
Table 83. Key Data Information from Secondary Sources
Table 84. Key Data Information from Primary Sources
List of Figures
Figure 1. Product Picture of Ureido Methacrylate
Figure 2. Global Ureido Methacrylate Market Value by Type, (US$ Million) & (2022 VS 2029)
Figure 3. Global Ureido Methacrylate Market Share by Type: 2022 VS 2029
Figure 4. 25% Purity Product Picture
Figure 5. 50% Purity Product Picture
Figure 6. Global Ureido Methacrylate Market Value by Application, (US$ Million) & (2022 VS 2029)
Figure 7. Global Ureido Methacrylate Market Share by Application: 2022 VS 2029
Figure 8. Architectural Coatings
Figure 9. Adhesives
Figure 10. Textile & Leather
Figure 11. Global Ureido Methacrylate Production Value (US$ Million), 2020 VS 2024 VS 2031
Figure 12. Global Ureido Methacrylate Production Value (US$ Million) & (2020-2031)
Figure 13. Global Ureido Methacrylate Production Capacity (Kiloton) & (2020-2031)
Figure 14. Global Ureido Methacrylate Production (Kiloton) & (2020-2031)
Figure 15. Global Ureido Methacrylate Average Price (US$/Ton) & (2020-2031)
Figure 16. Ureido Methacrylate Report Years Considered
Figure 17. Ureido Methacrylate Production Share by Manufacturers in 2024
Figure 18. Ureido Methacrylate Market Share by Company Type (Tier 1, Tier 2, and Tier 3): 2020 VS 2024
Figure 19. The Global 5 and 10 Largest Players: Market Share by Ureido Methacrylate Revenue in 2024
Figure 20. Global Ureido Methacrylate Production Value by Region: 2020 VS 2024 VS 2031 (US$ Million)
Figure 21. Global Ureido Methacrylate Production Value Market Share by Region: 2020 VS 2024 VS 2031
Figure 22. Global Ureido Methacrylate Production Comparison by Region: 2020 VS 2024 VS 2031 (Kiloton)
Figure 23. Global Ureido Methacrylate Production Market Share by Region: 2020 VS 2024 VS 2031
Figure 24. North America Ureido Methacrylate Production Value (US$ Million) Growth Rate (2020-2031)
Figure 25. Europe Ureido Methacrylate Production Value (US$ Million) Growth Rate (2020-2031)
Figure 26. China Ureido Methacrylate Production Value (US$ Million) Growth Rate (2020-2031)
Figure 27. Japan Ureido Methacrylate Production Value (US$ Million) Growth Rate (2020-2031)
Figure 28. Global Ureido Methacrylate Consumption by Region: 2020 VS 2024 VS 2031 (Kiloton)
Figure 29. Global Ureido Methacrylate Consumption Market Share by Region: 2020 VS 2024 VS 2031
Figure 30. North America Ureido Methacrylate Consumption and Growth Rate (2020-2025) & (Kiloton)
Figure 31. North America Ureido Methacrylate Consumption Market Share by Country (2020-2031)
Figure 32. Canada Ureido Methacrylate Consumption and Growth Rate (2020-2025) & (Kiloton)
Figure 33. U.S. Ureido Methacrylate Consumption and Growth Rate (2020-2025) & (Kiloton)
Figure 34. Europe Ureido Methacrylate Consumption and Growth Rate (2020-2025) & (Kiloton)
Figure 35. Europe Ureido Methacrylate Consumption Market Share by Country (2020-2031)
Figure 36. Germany Ureido Methacrylate Consumption and Growth Rate (2020-2025) & (Kiloton)
Figure 37. France Ureido Methacrylate Consumption and Growth Rate (2020-2025) & (Kiloton)
Figure 38. U.K. Ureido Methacrylate Consumption and Growth Rate (2020-2025) & (Kiloton)
Figure 39. Italy Ureido Methacrylate Consumption and Growth Rate (2020-2025) & (Kiloton)
Figure 40. Russia Ureido Methacrylate Consumption and Growth Rate (2020-2025) & (Kiloton)
Figure 41. Asia Pacific Ureido Methacrylate Consumption and Growth Rate (2020-2025) & (Kiloton)
Figure 42. Asia Pacific Ureido Methacrylate Consumption Market Share by Regions (2020-2031)
Figure 43. China Ureido Methacrylate Consumption and Growth Rate (2020-2025) & (Kiloton)
Figure 44. Japan Ureido Methacrylate Consumption and Growth Rate (2020-2025) & (Kiloton)
Figure 45. South Korea Ureido Methacrylate Consumption and Growth Rate (2020-2025) & (Kiloton)
Figure 46. China Taiwan Ureido Methacrylate Consumption and Growth Rate (2020-2025) & (Kiloton)
Figure 47. Southeast Asia Ureido Methacrylate Consumption and Growth Rate (2020-2025) & (Kiloton)
Figure 48. India Ureido Methacrylate Consumption and Growth Rate (2020-2025) & (Kiloton)
Figure 49. Latin America, Middle East & Africa Ureido Methacrylate Consumption and Growth Rate (2020-2025) & (Kiloton)
Figure 50. Latin America, Middle East & Africa Ureido Methacrylate Consumption Market Share by Country (2020-2031)
Figure 51. Mexico Ureido Methacrylate Consumption and Growth Rate (2020-2025) & (Kiloton)
Figure 52. Brazil Ureido Methacrylate Consumption and Growth Rate (2020-2025) & (Kiloton)
Figure 53. Turkey Ureido Methacrylate Consumption and Growth Rate (2020-2025) & (Kiloton)
Figure 54. GCC Countries Ureido Methacrylate Consumption and Growth Rate (2020-2025) & (Kiloton)
Figure 55. Global Production Market Share of Ureido Methacrylate by Type (2020-2031)
Figure 56. Global Production Value Market Share of Ureido Methacrylate by Type (2020-2031)
Figure 57. Global Ureido Methacrylate Price (US$/Ton) by Type (2020-2031)
Figure 58. Global Production Market Share of Ureido Methacrylate by Application (2020-2031)
Figure 59. Global Production Value Market Share of Ureido Methacrylate by Application (2020-2031)
Figure 60. Global Ureido Methacrylate Price (US$/Ton) by Application (2020-2031)
Figure 61. Ureido Methacrylate Value Chain
Figure 62. Ureido Methacrylate Production Process
Figure 63. Channels of Distribution (Direct Vs Distribution)
Figure 64. Distributors Profiles
Figure 65. Bottom-up and Top-down Approaches for This Report
Figure 66. Data Triangulation
※参考情報 ウレイドメタクリレートという化合物は、特に高分子材料やコーティングなどの分野で重要な役割を果たしています。この化合物は、ウレイド基とメタクリレート基が結合した構造を持ち、これにより様々な物性を持つ新しい材料を作り出すことが可能です。以下に、ウレイドメタクリレートの概念について詳述いたします。 ウレイドメタクリレートは、ポリマー化が可能な構造を備えているため、重合反応によって高分子化合物を形成することができます。これにより、透明性、耐熱性、耐薬品性など、様々な特性を持つ材料を製造できます。特に、これらの特性は工業的な用途において非常に重要です。 ウレイドメタクリレートの特徴について考えると、まず第一に、その高い反応性が挙げられます。メタクリレート基は、フリーラジカル重合を容易に行うことができ、多様な化学反応を通じて新しい結合を形成することが可能です。これにより、分子構造を自由に設計できるため、用途に応じた特性を持たせることができます。また、ウレイド基は、ポリマーの物性を改善するための効果的な機能性グループであり、接着性や弾性、耐水性を向上させることができます。 ウレイドメタクリレートの種類には、さまざまな構造を持つものがあり、これにより異なる特性を持つ素材が得られます。例えば、アクリル系ポリマーやウレタン系ポリマーとして利用されることが一般的です。また、一般的にはウレイド基の種類や位置によって、さまざまな機能を有するウレイドメタクリレートが合成されます。これにより、特定の性能要求に応じた材料設計が可能になります。 用途について考えると、ウレイドメタクリレートは非常に多岐にわたります。例えば、再生可能エネルギー分野においては、バイオマス由来の材料として使用されることが増えています。また、電子部品や自動車部品の製造においても、その優れた耐久性や耐熱性から、材料として広く利用されています。これに加えて、医療分野でも、生体適合性を有するポリマー材料として注目されています。 関連技術としては、まずフリーラジカル重合技術が挙げられます。この技術は、ウレイドメタクリレートを重合する最も一般的な方法であり、さまざまな条件下での反応を操ることで、望ましい特性を持つポリマーを合成することが可能です。また、UV硬化技術も重要です。これは、ウレイドメタクリレートを含む材料が、光照射によって急速に硬化する特性を利用するもので、コーティングや接着剤の分野での応用が進んでいます。 総じて、ウレイドメタクリレートは、その特有の化学的性質から、さまざまな産業において利用されている重要な素材です。今後もさらなる研究開発が進む中で、新たな用途や性能向上が期待されています。高分子材料としての可能性は無限大であり、持続可能な社会を実現するための重要な素材の一つと考えられています。 |
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