1. By committing to memory
   "she knew the poem by heart"
   - by memory

Encyclopedia: By heart

• ink-jet printer
• Inka
• inkberry
• inkblot
• inkblot test
• inkhorn
• inkiness
• inking pad
• inkjet
• inkle
• inkling
• inkpad
• inkpot
• inkstand
• inkwell
• inky
• inky cap
• inky-black
• inky-cap mushroom
• INLA
• inlaid
• inland
• inland bill
• Inland Passage
• Inland Revenue