1	0.500000
2	0.250000
3	0.750000
4	0.125000
5	0.625000
6	0.375000
7	0.875000
8	0.062500
9	0.562500
10	0.312500
11	0.812500
12	0.187500
13	0.687500
14	0.437500
15	0.937500
16	0.031250
17	0.531250
18	0.281250
19	0.781250
20	0.156250