Potential answers for "Hard-to-solve problem"

⭐⭐⭐⭐ KNOT
⭐⭐⭐ THINKINGCAP
⭐⭐⭐ UNTIE
⭐⭐⭐ BLACKBOARD
⭐⭐⭐ WORKIT
⭐⭐⭐ SWEEPUNDERTHERUG
⭐⭐⭐ LAUNDERMONEY
⭐⭐⭐ WIPEOFFTHEMAP
⭐⭐⭐ BRUSHASIDE
⭐⭐⭐ CLEANHOUSE

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