insert   a 1  0
   insert   a0 2048  4
insert   a_1   1  0
insert   a4    -1  0

insert   a 1  1
insert   a1   2  1
insert   b1   551  1
insert   b2   553  1

remove b1
remove b
remove 553 1
remove -1 0
remove 5  3

insert   a 1  1
insert   a1   2  1
insert   b1   551  1
insert   b2   553  1

regionsearch 0 0 768 768
regionsearch 752 752 224 224
regionsearch 0 0 -5 -5

duplicates
insert   a 1  1
insert   b 1  1
insert   a1   2  1
insert   b1   551  1
insert   b2   553  1
insert a 551 1
duplicates

insert   a 1  1
insert   b 1  1
insert   a1   2  1
insert   b1   551  1
insert   b2   553  1
insert a 551 1
search b1
search a
search c1

dump
insert   a 1  1
insert   b 1  1
insert   a1   2  1
insert x 257 1
insert   b1   551  1
insert   b2   553  1
insert a 551 1
dump