This is {TAIL ~ the fundamental relation} for {HEAD ~ a pair} of toroidal disks with an intermediate roller 
This is { TAIL ~ the fundamental relation } for { HEAD ~ a pair } of toroidal disks with an intermediate roller
OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH