makenull
insert -1 1597 Blacksburg
 insert 16384 4 Blacksburg
  insert 16383 16834 Blacksburg
   insert 8581 -8581 Blacksburg
  insert 5001 5012 Blacksburg
 insert 5001 5012 Christiansburg
insert 5001 6213 Blacksburg        
insert 5001 8414    Christiansburg       
insert 0 0 Floyd
insert 16383 16383      Virginia_Beach 
debug          




find Blacksbrug
find    Blacksburg     
remove -160                      15958
remove 0               -15958
remove    581    3851

remove 5001          5012

remove          5001 5012

remove   Blacksbrug
 remove Christiansburg










        insert 5002 1019 Radford
    search 0 16893 1
search 100     159     -1

search -100     159    500
search 0 68     1000000
search 5000       5000 100



  makenull
debug