1 table filter chain INPUT {
2 @if 0 MARK set-mark 0; @else MARK set-mark 1;
3 @if 1 MARK set-mark 2; @else MARK set-mark 3;
4 @if () MARK set-mark 4; @else MARK set-mark 5;
5 @if (0) MARK set-mark 6; @else MARK set-mark 7;
6 @if (1) MARK set-mark 8; @else MARK set-mark 9;
7 @if '' MARK set-mark 10; @else MARK set-mark 11;
8 @if '0' MARK set-mark 12; @else MARK set-mark 13;
9 @if ' ' MARK set-mark 14; @else MARK set-mark 15;