<H1> test_if1 </H1>
VAR2 defined (TRUE)
(if test 2)
VAR1 defined (if test 3 level 1)
VAR2 defined (if test 3 level 2)
VAR2 defined (if test 3 level 3)
------------------ <hr>
defined (TRUE)
(if test 1)
VAR1 defined (if test 3 level 1)
VAR2 defined (if test 3 level 2)
VAR2 defined (if test 3 level 3)
defined (if test 3 level 4)