How about keeping twenty-one fish?

White water can make a fortune.

Two things-two black soils and water-are not conducive to wealth.

Three things-three green trees drain water, which is not good for wealth.

Four-four Lvmu, although draining water, four greens are satellites, which is auspicious.

Five articles-five loess grams of water, which is not conducive to wealth.

Six articles-six white gold produces water, which is beneficial to wealth.

Seven articles-seven red gold and raw water. Although it is a bad star, it is based on good luck.

Eight-eight grams of water, but eight white stars are lucky.

Nine fires in nine purple, but right is better than xing. As a lucky star, you can prosper.

/kloc-more than 0/0 is divided into integers, such as 20 as 2 and 15 as 5.

* For reference only.