Interesting mathematical question: How can magicians use evolution theory to list only three-step comprehensive formulas or even two-step comprehensive formulas to find out how many dragonflies there are? Please list them separately. Suppose a dragonfly has two eyes and four legs, then one leg should be: 20 10*2=4020, and the extra leg is dragonfly: 4698-4020=678. Each dragonfly has two legs, so there are 678/2=339 dragonflies, just three steps, haha. If the latter two steps are combined, they can also be combined.

That is to say, we assume that a dragonfly also has two eyes and four legs, so a * * * leg should be: 20 10*2=4020, and a dragonfly is (4698-4020)/2=33. The second one is a bit difficult to understand. I wonder if it meets your requirements.