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