---
subnets: "{{ subnets_all | rejectattr('az', 'equalto', region + 'd') | list }}"
bootstrap_key: bootstrap
preferred_availability_zone: b
availability_zones:
  - eu-west-1a
  - eu-west-1b
  - eu-west-1c

---
subnets: "{{ subnets_all | rejectattr('az', 'equalto', region + 'd') | list }}"
bootstrap_key: bootstrap
preferred_availability_zone: c
availability_zones:
  - eu-west-1a
  - eu-west-1b
  - eu-west-1c

Set preferred_availability_zone to C as pricing as jumped in A and B.
Set preferred_availability_zone to C as pricing as jumped in A and B.
