| Characteristics |
Upper |
Lower |
Both |
| a-Bridge |
34% |
10% |
20% |
| b-A rectangle like |
24% |
20% |
6% |
| c-Simple top bifurcation |
56% |
12% |
14% |
| d-Simple bottom bifurcation |
6% |
68% |
12% |
| e-Closing bottom bifurcation |
2% |
50% |
4% |
| f-Closing top bifurcation |
38% |
12% |
2% |
| g-Star like bifurcation |
14% |
20% |
12% |
| h-Branch like top bifurcation |
40% |
18% |
2% |
| i-Branch like bottom bifurcation |
16% |
30% |
0% |
| j-A simple opening |
12% |
12% |
0% |
| k-Delta like opening |
6% |
18% |
2% |
| l-A triangle like |
10% |
16% |
6% |
| m-Crossing line |
22% |
20% |
14% |
| n-An eye |
14% |
28% |
2% |
| o-A hook |
12% |
24% |
20% |
| p-A line |
8% |
20% |
41% |
| q-A dot |
14% |
8% |
4% |
| r-A group of dots |
4% |
18% |
0% |
| s-A double eye |
10% |
18% |
8% |
| t-A fence |
20% |
16% |
20% |
| u-A double fence |
8% |
10% |
0% |
| v-A pentagonal arrangement |
8% |
14% |
2% |
| w-A Hexagonal arrangement |
6% |
20% |
0% |
| x- A Bar |
14% |
12% |
0% |
