1A (A) [Y/n/?] (NEW) 
 2  A0 (A0) [Y/n/?] (NEW) 
 3    A1_0 (A0_0) [N/y/?] (NEW) 
 4  A1 (A1) [Y/n/?] (NEW) 
 5    choice
 6    > 1. A1_0 (A1_0) (NEW)
 7      2. A1_1 (A1_1) (NEW)
 8    choice[1-2?]: 
 9B (B) [N/y/?] (NEW) 
10C (C) [N/y/?] (NEW)