Identifying Permissions for Roles

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Is there a good/efficient way to determine which permissions have been assigned to which roles? I built a report that identifies which roles have been assigned to specific users. But I would also like to know what exactly the permissions are for each role. Short of going into each role and looking to see what permissions it has, is there an easier way of doing this? It didn't immediately look like it was a report that could be built. I've inherited a bit of a mess.  

Thanks -

Kris