Input: Identify the most salient words:

travelling on a train through countryside .

Output: countryside
train
travel

Input: Identify the most salient words:

content passengers traveling risky by roof of train while train going on the green forest at outskirts

Output: roof
train
travel

Input: Identify the most salient words:

surfer and tv producer visit build series to discuss .

Output: build
discuss
visit

Input: Identify the most salient words:

soldiers stand guard at checkpoint .

Output:
checkpoint
guard
soldier
stand