$4\mathrm{.}2-2$c$.$ Packet scheduling $($RR$).$ Consider again the same pattern of red and green packet arrivals to a router$$s output port queue, as shown above $($in question $4\mathrm{.}2-1$a$).$ Indicate the sequence of departing packet numbers $($at t $=1,2,3,4,5,6,7)$ under round$-$robin scheduling, with two classes of packets $($red and green$).$ Match each time unit $($t$=1,$ t$=2,$ t$=3....)$ with the number of the packet that was transmitted and thus "departs" at that time unit. You can assume that if there are both red and green packets waiting for transmission following an idle slot $($only$)$ that the red will be transmitted first.