question:  How did Lane eventually find the Mayor?
context: Raging , Trooper Lane hovered three thousand feet above Tammany Square. The cool cybrain surgically implanted in him was working on the problem. The black dog was on Lane's back. Old Mayor himself was going to hear about it. The humming paragrav-paks embedded beneath his shoulder blades held him motionless above Newyork's three administrative towers. Mayor's Palace. They don't teach them about their own city, that they'll be fighting for. Old cybrain, a gift from the Trooper surgeons, compliments of the city, would have to figure out which one. Two black paragrav-boats whirred along the translucent underside of Newyork's anti-missile force-shield, the Shell. Lane somersaulted. Cybrain had taken charge of his motor nerves. Lane's own mind was just along for the ride. He began to plummet down, picking up speed. Lane dropped lightly to the floor, inside the room, in battle-crouch. "Lashing police with his vibray," said the announcer, "Lane broke through the cordon surrounding Manhattan Armory. Two policemen were killed, four others seriously injured. Tammany Hall has warned that this man is extremely dangerous. Citizens are cautioned to keep clear of him. Lane is an insane killer. A built-in electronic brain controls his reflexes—" "At ease with that jazz," said Lane, and a sheathed finger snapped out. The two police boats were hovering above the towers. Lane's mailed hand snapped open a pouch at his belt. The force-bomb "exploded"—swelled or inflated, really, but with the speed of a blast. It shaded the view from his window and re-entered the tower wall just below. "Trooper Lane, of the Newyork Special Troops, is all." Built, Lane saw. "I'm the guy they told you about on the 3V. Where's the Mayor? From Mars. Sure, I've heard of it—you gotta go by spaceship. He takes orders from Newyork." But also the road to the return to city-states.
output:  He had some clues from Gerri and the rest was instinct
options:  Gerri helped him plan his route  He had some clues from Gerri and the rest was instinct  The cybrain knew exactly where to go after he jumped  The Mayor had a flag indicating his room