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$ perl -Mstrict -Mwarnings -E '
    my $string = "---------xxxxxxxxxxxxxxx------yyyyyyyyyyyyyy--------
+";
...
    say $string;
'
?xxxxxxxxxxxxxxx------yyyyyyyyyyyyyy?

$ perl -Mstrict -Mwarnings -E '
    my $string = "---------xxxxxxxxxxxxxxx------yyyyyyyyyyyyyy--------
+";
...
    say $string;
'
?????????xxxxxxxxxxxxxxx------yyyyyyyyyyyyyy????????