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my $a;
$a = " Some stuff here
       Some more stuff on the next line ";

my $string = <<END_HERE;
Here is some text.
...
are expected.  A here document won't
confuse people.
END_HERE

print << END_HERE;
Here is multi-line
text created with a 
here document.
END_HERE

my $string;
$string = <<END_HERE;  # Seen as double quotes.
...
END_HERE

...and so on.