Certainly, {HEAD ~ such games} are not designed for {TAIL ~ adjustability} of the relative importance played by chance and skill 
not designed for
Certainly , { HEAD ~ such games } are not designed for { TAIL ~ adjustability } of the relative importance played by chance and skill
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH