Expert advice on multivibrator...

Guys,
I need a system... like 2 lights (LED of course).... alternating....

|------------| |----------------|
|light set 1 | |light set 2 |
|turned on | ----Alternating-----| turned on for |
|for 1 sec| |rest 1 sec |
|f=1Hz. | |while set 1 is |
|------------| |off. f=1hz |
|----------------|

Each light set will blink for 4 times when they are on.... means 1/4th of actual time... and 1/4th of each half cycle of the first alternator/multivibrator.

So finally it will be like...


{for first 1 sec, light set 1
blick 4 times in 1 sec.}
|===================| |===========
|----| |----| |----| |----| |
| | | | | | | | |
| | | | | | | | |
| |----| |----| |----| | |
| |===================|

{when set 1 is off,
set 2 is on, blinking for 4
times within this 1 sec.}
|<------------1sec------------->|
|<--------------------------------2 sec---------------------------->|

guys, any idea?? It will run from 12V, it will drive 32 LEDs in each set. So per sec 32 LEDs will blink for 4times and then another 32LEDs will blink for four times while set is off. Alternating. And the whole system have to be 50-50 duty cycle...

(Note it is like the police lamp...) Help me guys!!!!