{TAIL ~ This biasing force} will return {HEAD ~ the flap portion} into contact with the base once an insect has lifted the flap to enter the trap 
{ TAIL ~ This biasing force } will return { HEAD ~ the flap portion } into contact with the base once an insect has lifted the flap to enter the trap
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH