Potential answers for "Source of unwelcome strains"

⭐⭐⭐⭐ FLU
⭐⭐⭐ FLUS
⭐⭐ SING
⭐⭐ TAXES
⭐⭐ SIFTS
⭐⭐ TENSES
⭐⭐ TRIES
⭐⭐ TRIESHARD
⭐⭐ ARIA

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