{var $a, $b, $c, $d, $e}
Hello $world$ 
\{var $a = 2}
\{var $a = 2\}

\\{$b = "set!"}

\\\{$c = "Not set"}

\\\\{$d = "SET!"}

\\\\\{$e = "NOT SET!"}

$a, $c
{$a}, {$b}, {$c}, {$d}, {$e}