Claim 2: The conveyor belt Y is characterized by B. ..
Claim 3: A conveyor belt Z is characterized by A and B. ..
Claim 1 is not related to the technical features of Claim 2, and there is no singularity. The weight 1 contains the characteristics of A, and the weight 3 also contains the characteristics of A. The weight 1 and the weight 3 are unitary. Right 2 has B and right 3 also contains the singularity of B.