1 2 3 4 5 6 7
1 2 3 4 -1 -2 -3 -4 1.1 2.2 -1.1 -2.2 3.-7 3.+7 -3.-7 +3.+7 1/2 1/3 1/4 1/5 -1/2 -1/3 -1/0 -73849/5678