% git log --topo-order
commit 44059c0835f7607dd5991ddf1f84fdccc3c91548
Merge: 8a50d5a... 127190e...
Date:  Wed Mar 5 13:11:20 2008 +0100

    Mainline commit #20: merge from topic branch.

commit 127190e9fae0a63739c705e857502d75913f5eca
Date:  Wed Mar 5 13:09:41 2008 +0100

    Topic branch commit #2.

commit ea27be5d59915e157bfa5beda435e00f450eed14
Date:  Wed Mar 5 13:09:11 2008 +0100

    Topic branch commit #1.

commit 8a50d5ae411a0bd91d31663d32809d221aba3295
Date:  Wed Mar 5 13:09:48 2008 +0100

    Mainline commit #19.

commit e676e8587537058323f58cd41bc7bd49ef841e5d
Date:  Wed Mar 5 13:09:20 2008 +0100

    Mainline commit #18.

commit 1f7cb5e29fd3b611aad6237f914cf23bc700fb49
Date:  Wed Mar 5 13:08:53 2008 +0100

    Mainline commit #17.