Related Clues:

• Kindergartener's hurdle
• Kid stuff, literally
• 'Sesame Street' subject
• First principles
• Basic facts
• Early instruction
• Elementary teachings
• Set of characters
• See 53 Across
• It goes from A to Z
• First grade basics
• Classroom recitation
• ''Sesame Street'' stuff
• Simple skills
• "Now I know my ___"