In fact, it is easy to get rid of the restrictions of junior high school knowledge.

Many of them conform to 2D+C = E+F (precipitation). The precipitation of AlCl3+3Na [Al (OH) 4] = 3NaCl+4Al (OH) 3 was proposed.

This is the reaction of high school, maybe you have to say, the coefficient is wrong! No, but there are many similar ones. Just find an amphoteric divalent hydroxide. Such as Zn. There are many more.

There are not many other restrictions, and you can scribble.

I provide a set: from A to F, Zn, ZnCO3, ZnCL2, Na4[Zn(OH)6], NaCl, Zn(OH)2.