{HEAD ~ The color codes} 17A and 19A disposed on the rail 16 of each rail assembly 42, 46 comprise {TAIL ~ a colored tape} 
comprise
{ HEAD ~ The color codes } 17A and 19A disposed on the rail 16 of each rail assembly 42 , 46 comprise { TAIL ~ a colored tape }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL