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Firewall feature set on router

We have a router connected to the internet with the firewall feature set on it.  NAT is also being done (internet interface outside, LAN interface inside)

There is an ACL applied to the internet interface in an outbound direction blocking all RFC 1918 adddresses, but the the internal network (192.168.1.0) still gets out, is this because NAT occurs before the outbound access-list is processed?

Thanks

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