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3. Unpredictable determinant

Alternative clues for the word xfactor

• Unknown element
• Hard-to-define element
• Its effect is hard to predict
• Secret weapon, perhaps
• Intangible quality responsible for four puzzle answers
• Hard-to-define influence
• Mystery quality ... or what 18- and 55-Across and 3- and 32-Down have?
• Mystery quality ... or wh
• Noteworthy special quality