Input: Identify the most salient words:

isotopes all atoms of element have the same number of protons .

Output: atom
element
isotope
number
proton

Input: Identify the most salient words:

slob on my knob like corn on the cob

Output: cob
corn
knob

Input: Identify the most salient words:

trees growing among the rocks of unesco world heritage site at blog

Output: rock
site
tree

Input: Identify the most salient words:

this recipe is a healthy way to celebrate fall flavors .

Output:
celebrate
recipe
way