Input: Identify the most salient words:

mass transportation system the high speed train between city and airport

Output: city
system
train

Input: Identify the most salient words:

spend time with a gorgeous kittens

Output: kitten
spend
time

Input: Identify the most salient words:

flying over island in a seaplane is the ultimate way to explore it .

Output: explore
island
way

Input: Identify the most salient words:

map from which users can select the district in which they want to browse hospitals .

Output:
district
map
select
user
want