Possible Clues:

• Agreement from Huck Finn
• Huck Finn's polite assent
• Polite reply to a schoolmarm
• Quaint reply to a woman
• Polite response to a schoolmarm
• Respectful reply to a schoolmarm
• Clipped affirmative
• Quaintly polite reply
• Mannerly reply from Tom or Huck
• Polite rural agreement