access-list acl_in permit tcp any any - creates an access list which permits
all tcp from any source to any destination

access-group acl_out in interface outside - binds the acl_out access list to
the outside interface (for inbound traffic).  You must determine what the
acl_out access list contains before determining the impact of this
access-group command.

and 

Access-list acl_in permit tcp any any - creates an access list which permits
all tcp from any source to any destination

access-group acl_in in interface inside - binds the acl_in access list
(created above) to the outside interface (for inbound traffic).

The access-list command creates your access lists and the access-group
command binds the list to an interface.  You can have multiple access-lists
and never bind them to an interface, however you can't have an access-group
command without an associated access-list.


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