The total weight of {HEAD ~ several stems} 112 and their flexible tips 116 is less than the typical force required to press {TAIL ~ a key} of a typical computer keyboard 
The total weight of { HEAD ~ several stems } 112 and their flexible tips 116 is less than the typical force required to press { TAIL ~ a key } of a typical computer keyboard
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH