Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Path category combination.
| Possible combination of route categories | |
| 1 | (h1) |
| 2 | (h2) |
| 3 | (h3) |
| 4 | (h4) |
| 5 | (h1, h2) |
| 6 | (h1, h3) |
| 7 | (h1, h4) |
| 8 | (h2, h3) |
| 9 | (h2, h4) |
| 10 | (h3, h4) |
| 11 | (h1, h2, h3) |
| 12 | (h1, h2, h4) |
| 13 | (h1, h3, h4) |
| 14 | (h2, h3, h4) |
| 15 | (h1, h2, h3, h4) |
