It's hard even from diagrams, because it's a 3-D (not 2-D) problem. Basically what you're looking for is to make a curvy line with the conduit that will pass through each of the junctions.

If you can, try making a model using something donut shaped. I just squished up paper and taped it and drew on junctions and conduit lines, but I was really wishing I had an inner tube and some electrical tape.

I found it helpful once I had figured out what I was supposed to do, to shuttle directly from one junction to the next in the order I had the current going. Kept me from making input errors.


I am going to put hints below, so here is some spoiler space:

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Spoilers ahead.
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If you go north from Junction A to Junction B, remember that the conduit from Junction B back to A must go south. (It is just one cable connecting the two together, even though you have to specify its direction in both places).

More spoiler ahead:
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If you look, you will see there are two junctions you cannot possibly connect. They need to be the starting and ending points in your circuit.

Good luck!