b7c7484
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
new (B → D ∧ B) → ((B ∨ D → B) → (A ∧ B → (D ∧ D → B) ∧ (D ∨ A))) intro intro intro cases 2 cases 2 constructor intro cases 7 cases 2 cases 7 exact 4 right exact 3
