 0 0 
1e-9 -1 
 100e-9 -1
 101e-9 -1
 200e-9 -1 
 201e-9 1
 300e-9 1
 301e-9 1
 400e-9 1
 401e-9 -1
 500e-9 -1
 501e-9 -1
 600e-9 -1
 601e-9 1
 700e-9 1
 701e-9 1
 800e-9 1
 801e-9 -1
 900e-9 -1
 901e-9 1
 1000e-9 1 
 1001e-9 -1
 1100e-9 -1
 1101e-9 1
 1200e-9 1 
 1201e-9 -1
 1300e-9 -1
 1301e-9 -1
 1400e-9 -1
 1401e-9 1
 1500e-9 1
 1501e-9 -1
 1600e-9 -1
 1601e-9 -1
 1700e-9 -1
 1701e-9 1
 1800e-9 1
 1801e-9 1
 1900e-9 1
 1901e-9 1
 2000e-9 1 