------ 6 8 10 12 ------ 4 4 4 4 ------ 19 22 43 50 ------ 2 4 6 8 ------ 3 4 5 6 ------ -1 0 1 2 ------ 1 3 2 4 ------ -2.00 ------ -2. 1. 1.5 -0.5 ------