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What exactly isn't working with that snippet?

```aws:ec2:Subnet (net-public-segments-az1-subnet):
    error: aws:ec2/subnet:Subnet resource 'net-public-segments-az1-subnet' has a problem: "Calling [toString] on an [Output&lt;T&gt;] is not supported.\n\nTo get the value of an Output&lt;T&gt; as an Output&lt;string&gt; consider either:\n1: o.apply(v =&gt; `prefix${v}suffix`)\n2: pulumi.interpolate `prefix${v}suffix`\n\nSee <https://www.pulumi.com/docs/concepts/inputs-outputs> for more details.\nThis function may throw in a future version of @pulumi/pulumi..Calling [toString] on an [Output&lt;T&gt;] is not supported.\n\nTo get the value of an Output&lt;T&gt; as an Output&lt;string&gt; consider either:\n1: o.apply(v =&gt; `prefix${v}suffix`)\n2: pulumi.interpolate `prefix${v}suffix`\n\nSee <https://www.pulumi.com/docs/concepts/inputs-outputs> for more details.\nThis function may throw in a future version of @pulumi/pulumi..11.0/24" is not a valid CIDR block: invalid CIDR address: Calling [toString] on an [Output&lt;T&gt;] is not supported.
    
    To get the value of an Output&lt;T&gt; as an Output&lt;string&gt; consider either:
    1: o.apply(v =&gt; `prefix${v}suffix`)
    2: pulumi.interpolate `prefix${v}suffix`
    
    See <https://www.pulumi.com/docs/concepts/inputs-outputs> for more details.
    This function may throw in a future version of @pulumi/pulumi..Calling [toString] on an [Output&lt;T&gt;] is not supported.
    
    To get the value of an Output&lt;T&gt; as an Output&lt;string&gt; consider either:
    1: o.apply(v =&gt; `prefix${v}suffix`)
    2: pulumi.interpolate `prefix${v}suffix`
    
    See <https://www.pulumi.com/docs/concepts/inputs-outputs> for more details.
    This function may throw in a future version of @pulumi/pulumi..11.0/24. Examine values at 'net-public-segments-az1-subnet.cidrBlock'.```

I am trying to get the cidrBlock from the vpc and then use it when creating a subnet:
```cidrBlock: `${cidrBlockFirstTwoSegments[0]}.${cidrBlockFirstTwoSegments[1]}.11.0/24````

Change this:

```cidrBlock: `${cidrBlockFirstTwoSegments[0]}.${cidrBlockFirstTwoSegments[1]}.11.0/24````
...to this:

```// Make sure you've imported `@pulumi/pulumi` into the file so that you can use the interpolate function.
cidrBlock: pulumi.interpolate `${cidrBlockFirstTwoSegments[0]}.${cidrBlockFirstTwoSegments[1]}.11.0/24````