{HEAD ~ a first wearable display} and a second wearable display of {TAIL ~ the plurality} of wearable displays, the first wearable display having: 
of
{ HEAD ~ a first wearable display } and a second wearable display of { TAIL ~ the plurality } of wearable displays , the first wearable display having :
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH