Two concurrent applications, a$1$ and a$2,$ execute the sequences of instructions $(j1,j2,j3)$ and $(k1,k2,k3),$ respectively. Execution switches between the applications whenever a timeout interrupt occurs or when one application terminates.

If a$1$ starts, and interrupts occur after instructions $j1$ and $k1,$ then what is the order in which the $6$ instructions will execute?