Related Clues:

• Hypothetical links
• Memory problems
• Readies a spark plug
• Crevices
• Generational disconnects
• Apertures
• Vacant areas
• Hiatuses
• Phalanx's weaknesses
• Missing links, so to speak
• Continuity problems
• Stereotypical Stone-Agers
• Orthodontic challenges
• Interruptions of continuity
• Tarzan types