{HEAD ~ The balls} are seated in {TAIL ~ each race}, and oil is supplied to the inside of each race through a hole formed thereon 
{ HEAD ~ The balls } are seated in { TAIL ~ each race } , and oil is supplied to the inside of each race through a hole formed thereon
HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH