Input: Identify the most salient words:

ships conduct a replenishment at sea

Output: conduct
replenishment
sea
ship

Input: Identify the most salient words:

the shepherd leads a flock of sheep grazing just as in biblical times

Output: lead
sheep
shepherd

Input: Identify the most salient words:

Two cats looking at one another through glass

Output: cat
glass
look

Input: Identify the most salient words:

one of the mountain ranges that surrounds lake .

Output:
lake
mountain
range
surround