Related Clues:

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• 'No clue'
• Comment made with a shrug
• ''Beats me!''
• 'I haven't the foggiest'
• "Beats me!"
• 'Ya got me'
• 'No idea'
• 'Who knows?!'
• ''Search me''
• "Beats me," slangily
• "I give up!"
• ''How should I know?''
• 'Hell if I know'
• Unhelpful answer