Related Clues:

• L-P content?
• Start of a beginner's piano scale
• Q-U queue
• They're 18 to 21
• L-P middle
• Q-U center
• Character string
• Three on a 6
• Letters after B
• String between B and F
• Trio after L
• 6 letters on a phone?
• Post-Q string
• Bridge between Q and U
• Keypad trio