. 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 2 2 2 3 0.5 0.5 3 3 3.5 1 - 2 1 - 2 1 - 2 1 - 2 1 - 2 1 - 2 1 - 2 . 2.5