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Downward Flow

Traffic by default, can travel "downward" (from a higher to lower security zone) freely without ACL's.  If you are going from a private IP space to a public, you will need to NAT though (see above).  

Just NAT

As long as there is no current ACL on the high security interface, an outbound NAT is all that is needed to allow outbound traffic flow.  (you 
object network VIP_PAT
  nat (inside,outside) dynamic

ACL and outbound NAT: