Here is my (short and simple) Verilog code to make an array of LEDs blink.
It works.

http://pastebin.com/guQcNkwp

But note that in the module, the LED array is declared as an output reg.
Initially, I tried to use an output wire because I thought a "wire" was
necessary to route a signal to a pin or something. But then I got an error
so I changed it to reg and it works, but I don't know why. I don't really
understand how the register is being routed to the pins of the LEDs.

I don't *really* understand the difference between a wire and reg, and none
of the books I've been reading explain that. Can anyone help?
--=20
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