host-1
host-2

[group_1]
host-1-1
host-1-2

[group_1:children]
group_1_1
group_1_2
group_1_3

[group_1_1]
host-1-1-1
host-1-1-2

[group_1_2]
host-1-2-1

[group_1_2:children]
group_1_2_1

[group_1_2_1]
host-1-2-1-1
host-1-2-1-2
host-1-2-1-3
