Alternatively, the data can be stored in {TAIL ~ fixed locations} and the portals moved from {HEAD ~ location} to location 
Alternatively , the data can be stored in { TAIL ~ fixed locations } and the portals moved from { HEAD ~ location } to location
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH