What are the keywords in the following sentence? leather salesman in his stall outside the central market
market, salesman, stall

What are the keywords in the following sentence? the logo over image of violin shaped tree
image, logo, tree

What are the keywords in the following sentence? male hands tightening the bolts in the bumper
bolt, hand, tighten

What are the keywords in the following sentence? yellow corn field with blue sky at the end of summer
field, sky, summer