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my %hash_of_hashes;

...
    # add this hash to the hash-of-hashes:
    $hash_of_hashes{$record_no} = \%unitfiles_hash;
}

my %hash_of_hashes;

...
         Photo_permission => $f[14],
    };
}

my %hash_of_hashes;

...

    $hash_of_hashes{$rn} = \%h;
}