Some of the most notable flags in the world have feature blue and yellow (also known as blue and gold): European Union, Kazakhstan, Sweden, and Ukraine.
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Flags With Blue and Yellow - WorldAtlas
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Worldatlas.com on X: How many countries have flags with blue and yellow? 💙 💛 / X
Children's World Atlas For South Africans — Wordsworth Books
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World Atlas - Apps on Google Play
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Flags With Blue and Yellow - WorldAtlas