In a previous lab, we used a repeat block to avoid duplicating code. Similarly, we can use a custom block to avoid duplicating code. Below is some code to draw a tic-tac-toe board. Your goal is to create blocks that make this code simpler.

Some things to remember:

• As a first step, break up this drawing task into meaningful sub-tasks. We suggest doing this working with pen and paper, not while looking at the code!
• Give your new blocks appropriate names. You want to make it easy to read the code—at its best, like natural, english sentences— and understand what it does.
• It may make sense to "split" some blocks up into different custom blocks. For instance, a single might be better performed as a in one custom block followed by a in another.

Use this Snap! project, duplicate of the image above, to get started.