----------------------------------------
# # # 
1 1 0 
....main....
[ext] H; P: Univ; Q: Univ; v: (P  Q)  P; v1: P  False

BY dT 4
# 1. [ext] H; P: Univ; Q: Univ; v: (P  Q)  P; v1: P  P  Q
# 2. [ext] H; P: Univ; Q: Univ; v: (P  Q)  P; v1: P; v2: P  False

++++++++++
- : unit = ()
# 