For the cash flows shown, determine the incremental cash flow between machines $B$ and $A(a)$ in year $0,(0)$ in year $3,$ and $($c$)$ in year $6.$

a$)$ The incremental cash flow between machines $B$ and $A$ in year $0$ is $

b$)$ The incremental cash flow between machines $B$ and $A$ in year $3$ is $

c$)$ The incremental cash flow between machines $B$ and $A$ in year $6$ is $