The interior of {HEAD ~ each} of the toys includes a gyroscope, which when operated creates considerable rotational momentum, tending to resist {TAIL ~ the movement} of the toy by the user 
The interior of { HEAD ~ each } of the toys includes a gyroscope , which when operated creates considerable rotational momentum , tending to resist { TAIL ~ the movement } of the toy by the user
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH 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 OTH