group variable precence

Hi,

my gruestion is about the group varilabes, when the host is in more
groups and there are same variable keys. See next example

### INVENTORY
[cm]
ditlcm01 ansible_ssh_host=192.168.93.101 ansible_ssh_user=root
ditlcm05 ansible_ssh_host=192.168.93.105 ansible_ssh_user=root

[debian]
ditlcm01

[centos]
ditlcm06

### GROUP VARS
group_vars/cm.yml: test_var: cm
group_vars/debian.yml: test_var: debian
group_vars/centos.yml: test_var: centos

### PLAYBOOK