Part B:

For this part, the snack machine has an alert mechanism that notifies the vending machine company if a certain number $($N$)$ of unsuccessful vending errors happen. People are pushing the wrong numbers $$ either requesting lots of missing snacks $($maybe the most popular snacks are missing$)$ or straining the claw by requesting the locations the claw is using.

A vend error is when the snack machine tries to vend from an empty snack slot, or if the vending input is in the same space as the claw $($e$.$g$.,$ L$=3,$ T$=3).$