Construct PDA's for the following languages:

a) {a^i b^j c^k | i = j+k}

b) {a^i b^j c^k | j = i+k}

c) {a^n x | n>=0, xE{a,b}* and |x|<=n}

d) {xE(0,1}* | #(subscript)0(x) = #(subscript)1(x) + 1}