my $a = 1;
our $b = 2;
$a += $b + 1;
$b -= $b - 1;
$a *= $b + 1;
$a /= $b - 1;
$a .= $b . 'hello';
$a **= $b + 1;
$a &= $b;
$a &&= $b;
$b ||= $a;
$b |= 1;
$a ^= $b;
$a <<= $b;
$b >>= $a
