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Houses & Utilities
There are three houses in a row and three utilities
(gas,water,electricity) are in a row directly underneath the 3 houses.
You must draw a line from each house to each utility,
without the lines ever crossing or going through a house.
Can you connect the houses to the utilities?
This problem is impossible.
At least, it's impossible to connect the houses to the utilities on a flat two-dimensional sheet of paper.
The real world is three-dimensional, so power lines can go over or under each other.
