if (10 == 10)
then
  print "this is the if part - ok";
  print newline;
  i = 20;
  if (i < 10)
  then
    print "this is nested if - error";
    print newline;
  else
    if (i > 10)
    then
      print "this is nested nested if - ok";
      print newline;
      v = 20;
      if (i != v)
      then
        print "this is the nested*3 if - error";
        print newline;
      else
        print "this is the nested*3 else - ok";
        print newline;
      endif
    else
      print "this is nested nested else - error";
      print newline;
    endif
  endif
else
  print "this is the else part - error";
  print newline;
endif