    1.2      1      1      2
    1.5      1      2      3
    1.0      1      3      1
    1.7      1      4      4
    1.4      2      1      1
    1.9      2      2      4
    1.6      2      3      2
    1.5      2      4      3
    2.8      3      1      3
    2.1      3      2      2
    2.7      3      3      4
    2.0      3      4      1
    3.4      4      1      4
    2.5      4      2      1
    2.9      4      3      3
    2.7      4      4      2
