1<?xml version="1.0" encoding="UTF-8"?> 2<out>: Test for source tree numbering 3A: Level A 4A.a: Level B 5A.b: Level B 6A.b+a: Level C 7A.c: Level B 8A.c+a: Level C 9A.c+a+a: Level D 10B: Level A 11B.a: Level B 12B.a+a: Level C 13B.a+a+a: Level D 14B.a+a+a+a: Level E 15C: Level A 16C.a: Level B 17C.a+a: Level C 18C.a+a+a: Level D 19C.a+a+a+a: Level E 20C.a+a+b: Level D 21C.a+a+b+a: Level E 22C.a+b: Level C 23C.a+b+a: Level D 24C.b: Level B 25</out>