CONCEPTS: clock, station, train

GEN: The train is pulled up to the station under the clock.

CONCEPTS: fly, model, state

GEN: an aircraft turns away while aircraft model flies the approach over us state

CONCEPTS: balloon, city, event, float

GEN: balloon floats over a city during event

CONCEPTS: equation, find, give, line

GEN:
find the equation of a line perpendicular to given line and through .