Library/Memory automata/NPDA NPDA · Context-free mirrored string w·wʳ @thethinkmachine·version 1·CC BY 4.0·added 28 Sept 2026 The textbook Nondeterministic Pushdown Automaton example. Open in AutomataStudio More ▾ Open in the desktop app Download the .automaton file Source on GitHub pushpopacc The machine as drawn — 3 states, 12 transitions.