Input: Identify the most salient words:

tree grows through the middle of rocks

Output: grow
middle
rock

Input: Identify the most salient words:

civil passenger airplane standing near the gate

Output: airplane
gate
stand

Input: Identify the most salient words:

the kind of love i want

Output: kind
love
want

Input: Identify the most salient words:

earth rising over the lunar surface as seen by the mission .

Output:
earth
mission
rise