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Letter-shaped track
Else clues• A weather strip may fit into it
• Groove for a letter-shaped bolt
• Letter-shaped aperture
• Letter-shaped opening
• Letter-shaped opening for a bolt
• Letter-shaped opening in some pistons
• Letter-shaped workbench groove
• Mounting feature for shop machine parts
• Opening for a letter-shaped bolt
• Router table groove
• Workbench track