What are the five elements of futures varieties?

Crops (beans, wheat, rice and cotton) belong to the "wood" category.

Rubber, PTA, fuel oil and soybean oil belong to fire.

You can't divide it by year and month. The genuine product has defined its five elements. It is not that this year's wood belongs to water next year, but that we can choose whether it is suitable to do this kind of futures according to our annual horoscope strength and find a suitable five-element futures to do it.