flashing dc12? bulbs

I've got 2 bulbs (12vdc)..bulb A is to flash 5 times and stop then bulb B folows then flashess 5 times and stop then A and B both flashes 5 times and stop..i have couple of relays and timers..couple of transistors (mosfets)...chopper circuit to generate the pulse..how do i go about it?..