lines running along passenger side frame?

[Hethj7]

What are all these lines? There are 4 rigid lines and one that is flexible. I know one is a brake line and then I am assuming one is gas and one is e-brake. What is the third?

Also, how hard is it to replace any of these (and what steps are involved)? I hit a huge rock on the highway just now and it busted my brake line. I can't tell if the others are split open or not yet.

Luckily, as soon as it happened I pulled over and saw the brake fluid leaking. I was close enough to home to make it before all my fluid was lost, but now it looks like I will be spending the weekend replacing that line .