2. A system with input R(s) and response Y(s) is described by the following equations: X_{1}(s)=R(s)-Y(s) X_{2}(s)=G_{A}(s) X_{1}(s) X_{3}(s)=X_{2}(s)+X_{4}(s)-Y(s) X_{4}(s)=X_{3}(s) G_{B}(s) Y(s)=X_{4}(s) G_{C}(s) Assemble a block diagram representation of the

system, clearly showing and labelling all intermediate signals X1(s), X2(s), X3(s), X4(s), and all transfer functions GA(s), GB(s), Gc(s).