The student shall turn in five functions. you should use mymap1 and mymap2 in problem 3, 4, and 5 if it is needed. however, the best way to do so is you use built-in map to finish problem 3, 4, and 5 first. after they work, replace map with mymap1 or mymap2. if they still work, you can say that you implement them all correctly. if it doesn’t work, then you now that your mymap1 or mymap2 maybe incorrect.