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  From Erin of TX:

Draw 3 simple houses in a row. Leave a little space between each one. Next draw a dot under each house leaving some space there too. Each dot represents a utility. Each house needs to be connected to all 3 utilities. Draw lines to connect each utility separately to each house and try to get each utility to each house without crossing any lines. Have fun!!!!

Answer below...

 
 
   

To reveal the answer, click and drag your mouse between the lines:

 Draw upwards from the middle dot all the way through the  
 middle house. Then, from the top of that line draw  
 diagonally down towards each of the outer houses (this  
 should look like an arrow pointing up). Draw a line  
 connecting the middle uitility to the outer utilities and  
 then draw a line up from the outer dots to the outer houses.  
 Next, starting at the middle dot, draw a curve under and  
 around to the left house, making sure you go around the  
 other dot. Do the same for the other outer house.  
 And there you have it!  

not yet implemented