The following tables demonstrate correct structure and my lack of imagination
| Pets | Farm animals | Wild animals |
|---|---|---|
| Cat | Sheep | Kangaroo |
| Dog | Cow | Wombat |
| White rabbit | Pig | possum |
The following table is more complex, with two major headings, with each having two minor headings.
| Sea-dwelling | Land-dwelling | ||
|---|---|---|---|
| Fish | Mammal | Reptile | Mammal |
| Flathead | Porpoise | Snake | Elephant |
| Shark | Dolphin | Crocodile | Horse |
| Whale | Tuna | Lizard | Bat |