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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".