There is no clear definition of the three techniques, whether it is commonly known among the people, or academically, or in various occasions.

Does the landlord want to ask the world's three largest potatoes?

If yes, the answer is: cassava, sweet potato and potato.

The three potatoes in the cookbook "Three Sweet Potato Sliced Honey Dew" refer to: red sweet potato, yellow sweet potato and taro;

The three potatoes in the recipe "baked sweet potatoes" refer to: sweet potatoes, potatoes and taro;

The three sweet potatoes in the beverage "Honey Three Sweet Potato Syrup" refer to: sweet potato, purple potato and sweet potato;

……。