\set x 0
\set y :x
\set z :y
\set w :z
\set v :w
\set x :v
\set y :x
\set z :y
\set w :z
\set v :w
\set x :v
\set y :x
\set z :y
\set w :z
\set v :w
\set x1 :x
\set x2 :x
\set y1 :z
\set y0 :w
\set helloworld :x
