Potential answers for "Difficult problem"

⭐⭐⭐⭐ POSER
⭐⭐⭐⭐ NUT
⭐⭐⭐⭐ AHARDNUTTOCRACK
⭐⭐⭐⭐ STUMPER
⭐⭐⭐⭐ CONUNDRUM
⭐⭐⭐ THORNIEST
⭐⭐⭐ TOUGH
⭐⭐ TOUGHNUT
⭐ LISP
⭐ PAPERJAM

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