Tall structures can comprise electronic components, {HEAD ~ LEDs}, {TAIL ~ OLEDS}, or OLETs 
Tall structures can comprise electronic components , { HEAD ~ LEDs } , { TAIL ~ OLEDS } , or OLETs
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH