Teachpacks for How to Design Programs

# Hangman

### hangman.ss

The teachpack `hangman.ss` provides all the operations that `draw.ss` provides and the following two:

- `hangman : make-word reveal draw-next-part -> true`
  that is, it consumes three auxiliary functions: `make-word,` `reveal,` and `draw-next-part`
- `hangman-list : reveal-for-list draw-next-part -> true`
  that is, it consumes the functions `reveal-for-list` and `draw-next-part`.