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{"Street name" => "Sample Street",
"House number" => "123",
"ZIP Code" => "45678",
"City name" => "Randomcity"}

{"Sample Street 12345678 Randomcity" => ""}

use warnings;
use strict;
...
{
  "Sample Street 12345678 Randomcity" => "This_is_the_address_content"
+,
}