The invention also relates to {HEAD ~ a program} for causing {TAIL ~ a computer} to perform the three dimensional display method 
for causing
The invention also relates to { HEAD ~ a program } for causing { TAIL ~ a computer } to perform the three dimensional display method
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH