以下Perl程序的输出是哪个选项?
$txt="4257mn23";
while($txt =~ m/\G\d\d/gc){
print "$&,",pos $txt,",";
}
42,2,57,4,23,8,
42,2,57,4,23,6,
42,2,57,4,
42,3,57,5,
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