Each of the players at his turn can, if he elects to contribute to a word, generate a number of chance from {HEAD ~ a selected set} of {TAIL ~ numbers} 
of
Each of the players at his turn can , if he elects to contribute to a word , generate a number of chance from { HEAD ~ a selected set } of { TAIL ~ numbers }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL