效绵鼎 Intuition:PDa Think of an E-NFA with the additional power that it can manipulate a stack. Its moves are determined by: The current state(of its“NFA”), 2. The current input symbol (or E),and 3. The current symbol on top of its stack. 3Intuition: PDA ◼ Think of an ε-NFA with the additional power that it can manipulate a stack. ◼ Its moves are determined by: 1. The current state (of its “NFA”), 2. The current input symbol (or ε), and 3. The current symbol on top of its stack. 3