1 2 1 2 1 1 1 #### 1 2 1 2 ^ 1 < 0 > 1 #### 1 2 1 1 ^ ^ 0 > < 0 #### 0 > 2 < 0 v v 1 #### 1 < 0 > 1 v 3 1 1 3 #### < 0 > < 0 > v v 3 1 1 3 #### 3 < 0 > < 0 > 3