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brain surgery taxing sweaty stumper stringent sticky stickleback spiny spinous setaceous sapping recondite puzzling test testing thorny labor-intensive backbreaking mixed-up unfathomable wildering washboard vexed uphill uneath tricky toilsome ticklish poser overburdensome difficile demanding debilitating crippling controversial confusing cloggy bruising baffling augean arduous abstruse dilemma draining enigmatic mystifying knotty kittle killer involuted