Input: Identify the most salient words:

route marking cairn at the summit of mountain

Output: cairn
mark
summit

Input: Identify the most salient words:

the female flowers appear before the leaves in late winter or early spring .

Output: appear
flower
winter

Input: Identify the most salient words:

unloading catch from fishing boat at harbour

Output: boat
catch
harbour
unload

Input: Identify the most salient words:

donkey taking an exam in classroom

Output:
classroom
exam
take