{HEAD ~ CC6 F5}, where {TAIL ~ n} ranges from 3 to 8, inclusive 
where
{ HEAD ~ CC6 F5 } , where { TAIL ~ n } ranges from 3 to 8 , inclusive
HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH