The general rule is; ( and this is without going to have a look at a Mig 19 picture)
three lines to the leg actuator; One up line, one hyd down line & one emergency (Nitrogen usually) down line. There might be a separate actuator for an inboard door, in which case that might have two or three (in emergency the locks may come undone & the gear leg knocks it out of the way.
usually there is only one brake line down the leg, unless there's a backup brake system? not unheard of, but rare, could it be electrics in a tube?. Anti lock brake system?
Any other tubing in the well could be hydraulics going out to the aileron actuator, or, again, electrical wiring in a tube to protect it from stones etc off a spinning wheel. You could also get wiring out to pylons or integral tanks.
That lot may not have helped much, but I hope some of it does!
Pete