Potential answers for "Spell of grueling work"

⭐⭐⭐⭐ XXXX
⭐⭐⭐ SLOG
⭐⭐ ORAL
⭐⭐ ORALEXAMS
⭐⭐ ORALS
⭐⭐ ENDURO
⭐⭐ MENTALTOUGHNESS
⭐⭐ UPHILL

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