stem: submarine boat
choice: weapon hurt someone
choice: reproduce have child
choice: boot leather
choice: too long hair have haircut
choice: lion hunt zebra
choice: dog bone
choice: tree oak
choice: fruit eat
choice: dove peace
choice: museum city
choice: use computer type
choice: do some exercise do cool-down
choice: war opposite of peace
choice: earth round
choice: parent child
choice: piece whole
choice: eat vegetable good health
choice: stop your car step on brake
choice: oak tree