Then apply for area b, there are four kinds.

There are four types of area C, which are the same as and different from A..

If c is the same as a, then there are four kinds of d, and unlike a, there are only three ways to draw e.

If c is different from a, then there are four kinds of d, which should be divided into two categories, like a and different from a.

If d is the same as a, there are four kinds of e; If d is different from a, there are three kinds of e.

The above-mentioned * * * is:

5 * 4 * [1* 4 * 3+3 * (1* 4+3 * 3)] =1020 species.

If four colors are used, the analysis process is the same as above.

The results are as follows:

4 * 3 * [1* 3 * 2+2 * (1* 3+2 * 2)] = 240 species.