<v, Krein array>
<256, [ 25, 24, 3, 1, 3, 20 ]>

P =
[  1  80 100  75]
[  1  16   4 -21]
[  1   0  -4   3]
[  1 -16  20  -5]

Q =
[  1  25 200  30]
[  1   5   0  -6]
[  1   1  -8   6]
[  1  -7   8  -2]

L = 
[
    [1 0 0 0]
    [0 1 0 0]
    [0 0 1 0]
    [0 0 0 1],

    [ 0 80  0  0]
    [ 1 24 40 15]
    [ 0 32 24 24]
    [ 0 16 32 32],

    [  0   0 100   0]
    [  0  40  30  30]
    [  1  24  48  27]
    [  0  32  36  32],

    [ 0  0  0 75]
    [ 0 15 30 30]
    [ 0 24 27 24]
    [ 1 32 32 10]
]

L* =
[
    [1 0 0 0]
    [0 1 0 0]
    [0 0 1 0]
    [0 0 0 1],

    [ 0 25  0  0]
    [ 1  0 24  0]
    [ 0  3 19  3]
    [ 0  0 20  5],

    [  0   0 200   0]
    [  0  24 152  24]
    [  1  19 156  24]
    [  0  20 160  20],

    [ 0  0  0 30]
    [ 0  0 24  6]
    [ 0  3 24  3]
    [ 1  5 20  4]
]