Pushdown Automata

L = { aⁿbⁿ : n ≥ 0 } L = { aⁿb²ⁿ : n ≥ 0 } L = { aᵐbⁿc⁽ᵐ⁺ⁿ⁾ : m,n ≥ 0 } L = { aⁿbᵐcᵐdⁿ : m,n ≥ 0 } L = { wcwᴿ : w ∈ (a+b)* } L = { wwᴿ : w ∈ (a+b)* } L = { a^m b^n : m >= n >= 0 } L = { balanced parentheses } L = { a^n b^n c^m : n,m >= 0 } L = { w in {a,b}* : #a = #b } L = { a^n b^n } U { a^n b^(2n) }