1<H1> test_if1 </H1> 2 3 4 VAR2 defined (TRUE) 5 (if test 2) 6 7 VAR1 defined (if test 3 level 1) 8 VAR2 defined (if test 3 level 2) 9 VAR2 defined (if test 3 level 3) 10 11 12 13------------------ <hr> 14 defined (TRUE) 15 (if test 1) 16 17 18 19 VAR1 defined (if test 3 level 1) 20 VAR2 defined (if test 3 level 2) 21 VAR2 defined (if test 3 level 3) 22 defined (if test 3 level 4) 23 24 25 26