{HEAD ~ Each} of the color filters is used to realize {TAIL ~ red, green, and blue colors} 
is used to realize
{ HEAD ~ Each } of the color filters is used to realize { TAIL ~ red , green , and blue colors }
HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL