wirless network topology concerns

I have situation where I have 4 wireless devices. 2 wireless devices belong to one network. The other two wireless devices belong to another network.

Each wireless device need two unique frequencies and seperated by 8MHz. So as an example for the two wireless devices on network 1:

F1=2453MHz and F2=2461MHz.
F3=2457MHz and F4 = 2465MHz.

two wireless devices on network 2:

F1=2455MHz and F2=2463MHz.
F3=2459MHz and F4 = 2467MHz.


Since each network is made of 4 frequencies I can have up to 20 networks.

But here is where I get lost.......

The 2 wireless devices on network 1 and the 2 wireless devices on network 2 have to be 2 MHz apart. As an example you cant do this:

Network 1:
F1=2453MHz and F2=2461MHz for device 1
F3=2457MHz and F4 = 2465MHz for device 2

Network 2:
F1=2454MHz and F2=2462MHz for device 1
F3=2456MHz and F4 = 2464MHz for device 2


Knowing that i can theoretically have 20 networks. How many wireless devices and networks can i have and still maintain the 2MHz seperation of frequencies between networks?

Please provide somewhat of an explanation so that I can understand the concept.

I hope i made myself clear enough to get some positive feedback

I get lost too...if I read again your concerns I have to go to sleep...