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my $heap = ['Root', 'Child1', 'Child2', 'Grandchild1', Grandchild2'];

# "\0" is a null, right?
my $ns_heap = "R\0C1\0C2\0GC1\0GC2\0";
my $fw_heap = "R\0\0C1\0C2\0GC1GC2";