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