Potential answers for "Like the toughest problems"

⭐⭐⭐⭐ INSOLUBLE
⭐⭐ ALI
⭐⭐ HUMP
⭐⭐ TRIPLE
⭐⭐ SOLVABLE
⭐⭐ PBR
⭐⭐ LASTMILE
⭐⭐ THORNY
⭐⭐ RAREST
⭐⭐ WIFE

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