0        1        2        0
        1        2        0        1
        2        0        1        2
==================================================
        0        0        0        0
        0        0        0        0
        0        0        0        0
==================================================
        0        1        2        0
        1        2        0        1
        2        0        1        2
==================================================
       -2       -1        0       -2
       -1        0       -2       -1
        0       -2       -1        0
==================================================
       -1        0        1       -1
        0        1       -1        0
        1       -1        0        1
==================================================
        1        2        3        0        0
        2        4        6        0        0
        3        6        9        0        0
        4        8       12        0        0
        0        0        0        0        0
        0        0        0        0        0
==================================================
        0        0        0
        0        1        2
        0        2        4
        0        3        6
        0        4        8
==================================================
        0        0        0        0
        0        1        2        3
        0        2        4        6
==================================================
 0 0 0 0 1 2 0 2 4 0 3 6
=========================
 6 2 3
=========================
( -9 -6 -3 0 3 )
1 0 2
0 1 2
2 1 6
1 2 6
3 2 12
2 3 12
4 3 20
3 4 20
=========================