: Test for source tree numbering 1: Level A : Level B : Level B 1: Level C : Level B 1: Level C 1-1: Level D 2: Level A : Level B 1: Level C 1-1: Level D 1-1-1: Level E 3: Level A : Level B 1: Level C 1-1: Level D 1-1-1: Level E 1-2: Level D 1-2-1: Level E 2: Level C 2-1: Level D : Level B