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  1. or download this
    $b = 0;
    while ( @slog = $sth->fetchrow_array ) {
    ...
        ($a,$b) = split(/=/, $info);
        push(@info,$b)
    }
    
  2. or download this
    if (defined($info{$b})) { die "Duplicate reference"; }
    $info{$b} = $b;