1. Software is not the subject of patent protection. You can write the software as a method to realize a certain function of the device, and this method is regarded as a claim; the drawings attached to the description can only show a structural diagram of the device. You can also add a method flow chart. This writing method is only suitable for inventions. If it is a utility model, you cannot write method claims.
2. "3. According to the device A mentioned in claim 1, the characteristics are: B is composed of C and D; or is composed of C, D and E; or is composed of F alone." If there is no inventive step in right 1, then the unity of right 3 must be considered, and perhaps a separate application should be made; furthermore, when revising, the claims can only be deleted or merged, and the number of claims will not increase.