gistfile1.txt

developers_groups:
 - 'developres'
 - 'ninjas'

ops_groups:
 - 'ops'
 - 'wheel'

robots_groups:
 - 'robots'
 - 'terminators'

company_groups:
 - 'company'
 - 'company555'

all_groups: "{{developers_groups + ops_groups + robots_groups + company_groups}}"

users_accounts:
 - name: 'gkomissarov'
   uid: 2000
   gecos: "Gregory\ Komissarov"
   homedirectory: '/home/gkomissarov'
   email: 'grexxxrov@noxxdis.com'
   shell: '/bin/bash'
   groups: "{{ ','.join(company_groups + ops_groups) }}"