This means to work straight for 2 rows and then on the next row, which is the third row you increase at each end. Increase every 3rd row for 21 times in total.
Enjoy this page? Please pay it forward. Here's how...
Would you prefer to share this page with others by linking to it?
Click on the HTML link code below.
Copy and paste it, adding a note of your own, into your blog, a Web page, forums, a blog comment,
your Facebook account, or anywhere that someone would find this page valuable.