Why are there many similar firewall rules with "RPC-EPMAP" suffix?

On Windows8.1, there are many advfirewall rules named ... (RPC-EPMAP) with:

• same Local port: RPC Endpoint Mapper
• same Program: svchost.exe
• same Service: RPCSS

and I didn't find any difference between these rule definitions.

Why are there those similar rules?

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