PKRWUD, in Jim's puzzle you missed all of the outside line sections, just thought I'd interject. He is correct that those two are unsolvable, however your puzzle is lacking a lot of information leaving it open to multiple solutions from running any utility from the rear side of the utility itself to the rear side of the middle house and so on.
don't know if this helps any but have fun anyway. Thanks for the puzzles.
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Jason Kimball
"The Gecko"
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