A (A) [Y/n/?] (NEW)
A0 (A0) [Y/n/?] (NEW)
A1_0 (A0_0) [N/y/?] (NEW)
A1 (A1) [Y/n/?] (NEW)
choice
> 1. A1_0 (A1_0) (NEW)
2. A1_1 (A1_1) (NEW)
choice[1-2?]:
B (B) [N/y/?] (NEW)
C (C) [N/y/?] (NEW)