For example, {HEAD ~ the skilled artisan} can follow {TAIL ~ the RACE protocol} (Frohman et al. Proc 
follow
For example , { HEAD ~ the skilled artisan } can follow { TAIL ~ the RACE protocol } ( Frohman et al . Proc
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH