Input: Identify the most salient words:

charged particles colliding with atmospheric gases produce the aurora .

Output: aurora
charge
particle

Input: Identify the most salient words:

planes fly around the globe

Output: fly
globe
plane

Input: Identify the most salient words:

A white plane has bright orange stripes and is parked in a lot near other planes.

Output: park
plane
stripe

Input: Identify the most salient words:

A pizza with pepporoni's, peppers, cheese, sauce and herbs.

Output:
cheese
herb
pepper