---
- name: list subnet
  include: list.yml
  vars:
    subnet: "{{ item }}"
  when:
    - action is defined 
    - action == 'list'
    - (subnets | default([], true) | length) > 0
  with_items: "{{ subnets }}"

- name: In subnet state
  include: "{{ item.state | default('present', true) }}.yml"
  vars:
    subnet: "{{ item }}"
  when:
    - action is undefined 
    - (subnets | default([], true) | length) > 0
  with_items: "{{ subnets }}"

- name: Update/create subnet
  include: present.yml
  vars:
    subnet: "{{ item }}"
  when:
    - action is defined 
    - action == 'present'
    - item.state is undefined
    - (subnets | default([], true) | length) > 0
  with_items: "{{ subnets }}"

- name: Delete subnet
  include: absent.yml
  vars:
    subnet: "{{ item }}"
  when:
    - action is defined 
    - action == 'absent'
    - item.state is undefined
    - (subnets | default([], true) | length) > 0
  with_items: "{{ subnets }}"
...