no.subrepos

o    4:79d836707416 topic2
|
| o  3:2742914d19b2 topic1
|/
| o  2:09dd527b77ec
|/
o    1:6370ce18689a
|
o    0:7e3988f0f412



subrepo1

o      6:eb211547efbe         ~> subrepo2 675fa105b184
|
| o    5:a3db56ba38d3 topic3  ~> subrepo2 085a6376bbce
| |
| | o  4:3e43f76179ed topic2  ~> subrepo2 085a6376bbce
| |/
| | o  3:0bd1ae88632d topic1  ~> subrepo2 1532dee5d922
| |/
o |    2:111ee5cb00c8         ~> subrepo2 627ca21f914a
|/
o      1:a4bb39f3d42b         ~> subrepo2 627ca21f914a
|
o      0:f43f3725e922


subrepo2

o    4:085a6376bbce topic2
|
| o  3:1532dee5d922 topic1
|/
| o  2:675fa105b184
|/
o    1:627ca21f914a
|
o    0:5a88c102487e