{HEAD ~ The display system} may be used to edit, for example, to create or modify, {TAIL ~ the data tables} being graphically represented 
used to edit
{ HEAD ~ The display system } may be used to edit , for example , to create or modify , { TAIL ~ the data tables } being graphically represented
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL REL OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH