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my $foo = "Foo";
my $bar = "Bar";
my $string = $foo . $bar;
# $string contains "FooBar".

my $foo = "Foo";
my $bar = "Bar";
 $foo .= $bar;
# $foo now contains "FooBar"

my $this = "This";
my $that = "That";
...
my $other = "Other";
my $string = join "", $this, $that, $the, $other;
# $string now contains "ThisThatTheOther".