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>