Use `aws ec2 describe-regions`.
Regions are the unit of failure isolation. Knowing the region
codes by heart pays off forever:
us-east-1 N. Virginia (cheapest, biggest)
eu-central-1 Frankfurt
eu-central-2 Zurich
ap-southeast-1 Singapore
TASK
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Run `aws ec2 describe-regions` and confirm "eu-central-1" appears.
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