According to plant properties: radish and pepper, cabbage and eggplant (both12); Pepper cabbage group (green), radish eggplant group (non-green); A group of pepper eggplant (with stalks) and a group of radish cabbage (without stalks); Radish (edible root), pepper, eggplant and cabbage (edible fruit); Pepper eggplant group (seeds in edible part), radish cabbage group (seeds in edible part).

According to mathematics: radish and pepper, cabbage and eggplant; Radish cabbage, pepper eggplant; Radish eggplant, pepper cabbage. (4 different things are divided into two groups)