| Value | Category | Cases | |
|---|---|---|---|
| ? | 58 |
0.3%
|
|
| A | Very narrow passage | 336 |
1.7%
|
| AB | 220 |
1.1%
|
|
| ABC | 3 |
0%
|
|
| ABCDE | 1 |
0%
|
|
| ABD | 2 |
0%
|
|
| AC | 11 |
0.1%
|
|
| AX | 1 |
0%
|
|
| B | Roofs touching each other | 333 |
1.7%
|
| BC | 17 |
0.1%
|
|
| BCE | 1 |
0%
|
|
| BD | 3 |
0%
|
|
| BX | 5 |
0%
|
|
| C | Phone and power cables easily accessible | 226 |
1.1%
|
| CD | 6 |
0%
|
|
| CE | 3 |
0%
|
|
| D | Transformers | 36 |
0.2%
|
| DE | 3 |
0%
|
|
| E | Transmission post | 32 |
0.2%
|
| EX | 1 |
0%
|
|
| X | Other | 199 |
1%
|
| Z | None | 18365 |
92.5%
|