block  A     B     C     D
1   7.77  7.70  8.22  8.44
2   8.52  8.44  9.36  9.66
3   9.41  9.79 10.16 10.70
4  10.73 10.80 11.42 11.65
5  11.45 11.73 12.14 12.47