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start of tree
...
 11111   222 |     a = 0
  3333   444 |     b = 1

start of tree
...
     a     b   <-- classified as
 55555   666 |     a = 0
  7777   888 |     b = 1

filename aa ba ab bb no_of_items size_of_store
file1 11111 222 3333 444 15 30
file2 55555 666 7777 888 50 100
etc... (for extra files)

$resFolder = Somelocation; # defined in other part of the code
...
    close(FH1);
    close(FH2);