Please i've seen the answers there but they do not apply to my problem. Please i need a human computer science expert to help me answer this. This problem illustrates the improper action that can occur if both inputs to an $S-R$ latch are $1$ and are then changed back to $0.$ For the timing chart below, for $P=1$ and $Q=0$ initially, what happens to $P$ and $Q$ over the time period shown?

Design a Finite State Machine that models a simple vending machine. The machine should accept coins, quarters, dimes, and nickels, and dispense an appropriate item once the correct amount is deposited. Show your work.