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843

Centuries: 8th century - 9th century - 10th century

Decades: 790s 800s 810s 820s 830s - 840s - 850s 860s 870s 880s 890s

Years: 838 839 840 841 842 - 843 - 844 845 846 847 848


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Chemical compound

... selection. This is why materials such as brass, the superconductor YBCO[?], the semiconductor Aluminium gallium arsenide or chocolate are considered mixtures[?] or alloys ...