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Seven days a week, Rainbow has 7 colors, Guqin has 7 strings, 7 words quatrains, legend has 7 fairies, 7 colors: red, orange, yellow, green, blue, blue, purple, 7 music Notes: Do, Re, Mi, Fa, Sol, La, Si. In Western culture, 7 is generally considered to be a lucky number, but there is a saying of Lucky 7.