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• Side squared, for squares
• Carpentry calculation
• Type of rug
• Code that's not a secret
• Floor space
• Piece of land
• L x W
• Surroundings
• Geometrician's calculation
• What 'The Star-Spangled Banner' writer is in this puzzle
• It has a code
• Realm
• Kind of code used every day
• Nonsmoking ___
• Geometric measure