1<div class="top">
2 <div class="square">
3 <div class="square">
4 <div class="square">
5 <div class="square">
6 <div class="square"><div class="square">
7
8 </div></div>
9 </div>
10 </div>
11 </div>
12 </div>
13</div>
14<div class="bottom">
15 <div class="square">
16 <div class="square">
17 <div class="square">
18 <div class="square">
19 <div class="square"><div class="square">
20 </div></div>
21 </div>
22 </div>
23 </div>
24 </div>
25</div>
26<div class="left">
27 <div class="square">
28 <div class="square">
29 <div class="square">
30 <div class="square">
31 <div class="square"><div class="square">
32 </div></div>
33 </div>
34 </div>
35 </div>
36 </div>
37</div>
38<div class="right">
39 <div class="square">
40 <div class="square">
41 <div class="square">
42 <div class="square">
43 <div class="square"><div class="square">
44 </div></div>
45 </div>
46 </div>
47 </div>
48 </div>
49</div>