said second wearable display has {HEAD ~ a same constitution} as {TAIL ~ the first wearable display comprises}: 
as
said second wearable display has { HEAD ~ a same constitution } as { TAIL ~ the first wearable display comprises } :
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH