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