How to define 3 different material in those 3 parts？

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Hi, everyone.
I have known how to create the geometry in FEniCS. But it has 3 different parts with different materials. Can someone tell me how to how to define different materials in the 3 parts? Thanks

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See Defining subdomains for different materials — FEniCSx tutorial or
Electromagnetics example — FEniCSx tutorial
Which has several similar domains.