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# assuming
our %dictionary = read_dictionary_file_to_hash($dict_file);
...
    }
    return qr/^$tile_regex_string$/i;
}

# in init section
our $BLANK_TILE = '#';
...
          .= "$tile{0," 
            . $tile_hashref->{$tile}+$tile_hashref{$BLANK_TILE}
            . "}";