Distance Vector Multipath Routing Protoocol and RPF

I'm trying to understand how RPF is used in DMVRP. Can someone please tell me an easy to understand procedure to calculate the source based tree for the provided diagram? the problem is that i cannot understand why there are 2 arrows from each node to the other.

the source router is A and the multicast receivers are E G H

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Multiple arrows represent the multiple paths to the source or receivers. RPF is used in conjunction with the MDT to verify that multicast traffic is received on interfaces that are part of the tree. IF multicast traffic is received on an interface not part of the tree the traffic is disregarded.

harbor235 ;}
vidularandunuAuthor Commented:
I'm sorry,  by multiple arrows what i was referring to are that there are two arrows in the diagram for a single link. and this has two costs. i do not understand how to use that for the calculation..

Path to the source, path to the receiver.

harbor235 ;}

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vidularandunuAuthor Commented:
not exactly what i was looking for. but it helped.
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