I provision subnets in all availability zones.
I want a user to specify one or more availability zones to skip.
This seems like a use case for: https://www.hashicorp.com/blog/hashicorp-terraform-0-12-preview-for-and-for-each
This is an example of when you have single known item you want to remove from a list: https://github.com/hashicorp/terraform/issues/16044#issuecomment-368111237
Thoughts on how to remove all items in one list from another list? Is there documentation in what language the for is written in? Can I do two loops? Anything more efficient?