Where can I find a sample solution to some of the puzzles in 3.17? For example puzzle 13. Once I got to Lesson 18, I noticed that the code I wrote in Lesson 17 carries over. I don't have the confidence or experience yet to know if the code I wrote is a good model. I'm concerned that my code might lead me down a rat hole later on because I did not take something else into consideration. Model code at key points would be helpful to newbies like me.