knuder = [
    (1.797,0.397),
    (1.653,0.776),
    (1.430,0.883),
    (1.004,0.377),
    (1.057,0.577),
    (1.377,0.703),
    (0.790,1.043),
    (0.784,0.763),
    (2.530,0.730),
    (2.744,0.790),
    (2.530,0.397),
    (2.824,0.610),
    (1.624,1.277),
    (1.417,1.390),
    (1.184,1.510),
    (0.824,1.703),
    (2.070,1.083),
    (2.004,1.757),
    (2.351,1.173),
    (2.264,1.373),
    (2.378,1.313),
    (2.658,1.639),
    (2.565,2.476),
    (2.589,2.278),
    (2.114,2.185),
    (2.072,2.330),
    (2.225,2.258),
    (1.938,1.847),
    (1.815,1.811),
    (1.654,2.015),
    (1.759,1.983),
    (1.310,2.011),
    (1.326,2.658),
    (1.219,2.880),
    (1.512,2.813),
    (2.320,2.991),
    (2.314,3.389),
    (2.191,3.339),
    (1.797,3.941),
    (2.644,4.292),
    (3.577,4.320),
    (4.177,2.696),
    (3.852,2.389),
    (4.199,1.702),
    (2.807,2.300),
    (2.774,2.020),
    (2.761,1.900),
    (2.277,1.837),
    (2.230,1.970),
    (2.530,1.930),
    (2.670,1.790),
    (1.633,1.498),
    (1.787,1.331),
    (1.827,1.431),
    (2.557,0.250),
    (2.290,0.050),
    (2.237,0.437),
    (2.084,0.717),
    (2.417,0.917),
    (2.217,0.917),
    (1.552,1.079),
    (1.257,1.217),
    (1.404,1.277),
    (0.937,1.477),
    (0.877,1.230),
    (0.650,1.677),
    (0.157,1.910),
    (0.550,2.037),
    (1.024,1.763),
    (1.197,1.830),
    (1.370,1.683),
    (1.524,1.750),
    (1.524,1.617),
    (1.677,1.663),
    (1.890,2.317),
    (2.072,2.530),
    (2.841,3.329),
    (0.510,1.423),
    (2.037,0.870),
    (1.217,2.205)
]

D = 0.2