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  2. Phlegm Color Chart: What the Color of Your Phlegm Means

  3. Mucus: Phlegm, Causes, Colors & How To Get Rid Of It

  4. Brown Mucus: Reasons Why You Might Get It - WebMD

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  7. Phlegm Cheat Sheet: Recognizing Normal and Concerning Colors …

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  10. Sputum Color Causes and Meaning | Healthhype.com