or download this
# | inner assignment with a LHS (l) and RHS (r)
# llllllllll..v...rrrrrrr #
+ $x = 1, $y = 2, $z = 3.
(my ($x, $y, $z) = ( 1, 2, 3 )) = ('a', 'b', 'c' );
# llllllllll.................^..rrrrrrrrrrrrr #
+ $x = 'a', $y = 'b', $z = 'c'.
# | outter assignment with a LHS (l) a
+nd RHS (r)