Dub is, of course, correct. The fifth line goes to the junction at the rear pumpkin to supply the rear calipers. The shorter two of the four remaining lines should be for the rear calipers (since there is no travel to deal with) and the longer two of the four should be for the front. The front lines should also have an aluminum "ring" in the middle of them because there is a place for that to mount at the wheel spindle to keep the line out of the wheel/tire.
Quick piece of advice: if you are replacing the lines please be sure to plug up the hard lines when you take the old flex lines off. When I replaced my lines with stainless I let the brake system run dry, and have had a bear of a time getting it properly bled. If it does run dry, the engine has to be running while you do the bleed. I did all of this and I still think that I have some air in the lines because my brake pedel will hit the floor if I press on it hard enough.
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong, it usually turns out to be impossible to get at or repair."
-Douglas Adams, Mostly Harmless