
    o		<-- wd parent rev					"10"
    |  x	<-- file1_b changed, branch4		"9"
    x /		<-- file1_b changed					"8"
    |/
    o											"7"
    |
    x		<-- file1_a renamed to file1_b		"6"
   /
x /			<-- file1_a changed		"5"
|/
o			<-- another branch point, branch3, where file1_a renamed to file1_b		"4"
|  x		<-- file1_a changed in a branch2	"3"
x /			<-- file1_a changed		"2"
|/
o									"1"
|
x			<-- file1_a added		"0"


