You have now completed your 3rd round.
Continue working in this way, turn your work after each round, work 3 tr in the space between groups of tr along the side and (3 tr, 1 ch, 3 tr) in each chsp on the corners.
Each round you work will have one extra space on each side.
You may find it helpful to mark the 1st 4 chain of each row so you don't work past it.
Why do I turn my work after each row?
1. I was taught to do it this way as a child.
2. It makes the square reversible, there is no right or wrong side.
3. The work turns out straighter. Working the same way all the time makes the square a little wonky.
Make a square without turning and look at the difference.