Related Clues:

• Big differences
• Logical flaws
• Intervals
• Jarlsberg feature
• Familiar 18
• Spots in need of filling
• Alibi problems
• They may be punched
• Openings to be filled?
• Course features
• Cribbage board features
• They're often bored
• Interruptions
• They may be bridged
• Swiss-cheese features