Let's work through the operations step by step. I will list the results in order:

1. $- (3 + (6 - 6)) + 12$

   • Step 1: $(6 - 6) = 0$
   • Step 2: $- (3 + 0) + 12 = -3 + 12 = 9$
   • Result: 9

2. $(6 + 4) + 4$

   • Step 1: $6 + 4 = 10$
   • Step 2: $10 + 4 = 14$
   • Result: 14

3. $(+1) + (8 + 9)$

   • Step 1: $8 + 9 = 17$
   • Step 2: $+1 + 17 = 18$
   • Result: 18

4. $(-4) + [(3 + 8) + 4]$

   • Step 1: $3 + 8 = 11$, so $[(3 + 8) + 4] = 11 + 4 = 15$
   • Step 2: $-4 + 15 = 11$
   • Result: 11

5. $[1 + 2] - [2 + 4]$

   • Step 1: $1 + 2 = 3$, and $2 + 4 = 6$
   • Step 2: $3 - 6 = -3$
   • Result: -3

6. $(-1) + 12 - 4$

   • Step 1: $-1 + 12 = 11$