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use strict;
use warnings;
...
      print("repellent: ", Dumper($repellent), "\n");
   }
}

samtregar: {"a" => {"b" => {"c" => {"d" => {"_val" => "foo"}}}}}
repellent: {"a" => {"b" => {"c" => {"d" => {"_val" => "foo"}}}}}

use strict;
use warnings;
...
      print("repellent: ", Dumper($repellent), "\n");
   }
}

samtregar: {}
repellent: {"a" => {"b" => {"c" => {}}}}