Compare edges first.
The centre can distract. Scan the repeated rim rhythm before choosing.

Sixteen specimens appear identical until the light catches one altered edge. Inspect the full wall and select the single odd strike.
Enter the inspection roomOne coin differs by a notch, rim or centre mark. Find it with no more than three incorrect inspections.
The centre can distract. Scan the repeated rim rhythm before choosing.
Velvet frames and focused lamps make observation the central gesture.
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