Teachpacks for How to Design Programs

# Rectangles

### rectangle.ss

The teachpack `rectangle.ss` provides all the operations that `draw.ss` provides and the following one:
- `show : (list-of (list-of symbol)) -> void`
  which consumes a rectangle (a list of list of color symbols) and draws a rectangle onto an open canvas.
For legal color symbols, see the documentation for the draw.ss teachpack.