... erase A and move to qk if receiving a and at qj erase BC and move to qkAt qi erase A and move to qk if receiving a and at qj erase B and move to qm and at qm erase C and move ... A and move to qk if receiving a and at qj erase B and move to qm and at qm erase C and move to qk(qiAqk) → a(qjBqm)(qmCqk)2Pushdown Automata •There are context-free languages ... = {a, b} δ(q0, λ, 0) = {(q3, λ)}Γ = {0, 1} δ(q1, a, 1) = {(q1, 11)} z = 0 δ(q1, b, 1) = {(q2, λ)}F = {q3} δ(q2, b, 1) = {(q2, λ)}δ(q2, λ, 0) = {(q3, λ)}18Example 7.6...