Input: Identify the most salient words:

Four zebras gather together beneath the shade of a tree on the grass-swept plain.

Output: gather
plain
zebra

Input: Identify the most salient words:

A pizza is served with some wine and water.

Output: pizza
serve
wine

Input: Identify the most salient words:

shipping containers on a dock

Output: container
dock
shipping

Input: Identify the most salient words:

monarch inspecting troops some of whom are waving their helmets

Output:
monarch
troop
wave