1. If the player wants to synthesize a double base, he needs to turn on the transformation mode. After the player turns on the transformation mode, the other player should also turn on it at the same time, so that they can turn into double bases together. If the players don't start the conversion at the same time, the system will delete the structure and make the player's merger fail. Two-person manor needs two cohabiting people to live together so that their foundation can be combined.

2. A two-person manor needs two cohabiting people to live together, so that their foundation can be combined.