variable "${region_number}" {
         # Arbitrary mapping of region name to number to use in
         # a VPC's CIDR prefix.
         default = {
             us-east-1      = 1
             us-west-2      = 3
             us-west-1      = 2
             eu-central-1   = 4
             ap-northeast-1 = 5
         }
      }
      
      variable "${az_number}" {
         # Assign a number to each AZ letter used in our configuration
         default = {
             a = 1
             b = 2
             c = 3
             d = 4
             e = 5
             f = 6
         }
      }
      
      # Retrieve the AZ where we want to create network resources
      # This must be in the region selected on the AWS provider.
      data "aws_availability_zone" "${example}" {
         name = "eu-central-1a"
      }
      
      # Create a VPC for the region associated with the AZ
      resource "aws_vpc" "${example}" {
         cidr_block = "\${cidrsubnet("10.0.0.0/8", 4, var.${region_number}[data.aws_availability_zone.${example}.region])}"
      }
      
      # Create a subnet for the AZ within the regional VPC
      resource "aws_subnet" "${example}" {
         vpc_id     = "${aws_vpc.${example}.id}"
         cidr_block = "$\{cidrsubnet(aws_vpc.${example}.cidr_block, 4, var.${az_number}[data.aws_availability_zone.name_suffix])}"
      }
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      aws_availability_zone

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      Shortcut: tf_aws_availability_zone

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