How can I limit the formation of an EC2 instance in a particular region to only t2.nano instances?

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You can limit the formation of an EC2 instance in a particular region to only t2.nano instances by doing the following:

1. Go to the EC2 console.

2. Click on Launch Instance.

3. Choose the desired region.

4. In the Instance Type section, click on the "View all" link.

5. Select only the T2 instance family.

6. Select the t2.nano size from the list of available instance types.

7. Proceed with launching the instance.