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