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