Why are so many Arab flags red, green, black and white?

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Why are so many Arab flags red, green, black and white?

Why are so many Arab flags red, green, black and white?

Why are so many Arab flags red, green, black and white?

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8 days ago I made a flag for Arab Texans, well I got some feedback on my design and I made some more designs what do y'all think. : r/vexillology

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