Input: Identify the most salient words:

The man is thinking of buying a car.

Output: buy
car
think

Input: Identify the most salient words:

posting a letter in a post box

Output: box
letter
post

Input: Identify the most salient words:

monarch butterfly seeking nectar on a flower

Output: butterfly
nectar
seek

Input: Identify the most salient words:

A small meal of cooked meat and steamed broccoli.

Output:
meal
meat
steam