As a result of inclusion, objects included in the Operand B field are subtracted from the objects in the Operand A field. In addition, the objects in the Operand A field leave their traces on the objects in the Operand B field. In other words, in the place where the A and B objects combine/interpenetrate, new surfaces/faces are generated.
An example of an inclusion operation is presented in the following image (cylinder interpenetrating rectangular prism).
Inclusion of a cylinder in a rectangular prism (2 solids): Operand A = rectangular prism, Operand B = cylinder.
The operation of inclusion in a rectangular prism resulted in removing the part coming from the cylinder; whereas, the area of the side surface of the cylinder is divided into 2 areas (the cylinder still remains one object) at the place where the cylinder interpenetrates the rectangular prism.