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it turns out it doesn't like my idea of duplicating the subnet type names  here for an eks cluster, is this approach naive? is there a better way?

```// Create a VPC. availability zones to which the subnets defaults to the first 3 AZs in the current region.
let vpc = new awsx.ec2.Vpc('eks-vpc', {
  cidrBlock: "10.0.0.0/16",
  subnetSpecs: [
    { type: "Public", cidrMask: 20 },
  //  { type: "Public", cidrMask: 20 },
    { type: "Private", cidrMask: 20 },
 //   { type: "Private", cidrMask: 20 },
],
});```

Did you create the VPC and then attempt to change the `subnetSpecs`? If so, and if it's practical, just tear it down and start over. You're also probably better off with the default options here since you probably want a smaller public subnet than private.