Construct PDA for the language L={a^n b^n}:- https://www.youtube.com/watch?v=NEhCALWlfLY&list=PLXj4XH7LcRfBkMlS_9aebcY78NLFwhE4M&index=79

Construct PDA for the language L={a^n b^2n} :- https://www.youtube.com/watch?v=KXvl6QopXuc&list=PLXj4XH7LcRfBkMlS_9aebcY78NLFwhE4M&index=83

Construct PDA for the language L={WcW^r}:- https://www.youtube.com/watch?v=q1EHoeQSH0Y&list=PLXj4XH7LcRfBkMlS_9aebcY78NLFwhE4M&index=84

Construct PDA for the language L={WW^r}:- https://www.youtube.com/watch?v=RYkeaERKp9M&list=PLXj4XH7LcRfBkMlS_9aebcY78NLFwhE4M&index=85

Construct PDA for the language L={ w | na(w)=nb(w) } :- https://www.youtube.com/watch?v=tzSBlO03xRM&list=PLXj4XH7LcRfBkMlS_9aebcY78NLFwhE4M&index=87&t=333s