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apple:fruit
...
.
.
orange|fruit

Fruit:Apple:Granny Smith:Rotten Granny Smith
Fruit:Orange

use warnings;
...
    print (("\t" x $_tree->getDepth()), $_tree->getNodeValue(), "\n");
});

use warnings;
...
rotten granny smith:granny smith
orange:fruit

fruit
        apple
...
        rotten granny smith
fruit
        orange