for the route table association (docs) in the import section there are some missing words.

Import
is already associated, will result in an error (e.g., Resource.AlreadyAssociatedthe specified association for route table rtb-4176657279 conflicts with an existing association) unless you first import the original association. EC2 Route Table Associations can be imported using the associated resource ID and Route Table ID separated by a forward slash (/). For example with EC2 Subnets