1.         Two cylinders A and B are actuated by 5/2 valves with double solenoids, and controlled by
the ladder diagram shown in the following Figure. Draw a detailed sequence chart showing
the action of each element (i.e., each cylinder, switch, valve, solenoid, relay) following a
brief actuation of the START button. (30 pt.)

2.         Use the cascade method to design a ladder diagram for the sequence START, A+, B+, B-, A-,
assuming cylinder A actuated by a 5/2 valve with double solenoids and cylinder B actuated by
a 5/2 valve with a single solenoid and a return spring. (35 pt.)

3.         Use the Huffman method to design a ladder diagram as in Problem 2. (35 pt.)