a1,6895.854,449.517
a2,6186.659,423.715
a3,5031.439,598.862
a4,5101.541,1050.105
*********************
1,6127.3494,630.8833
2,5988.0827,795.6415
3,5492.7946,802.3349
4,5398.2769,712.1753
**********
a2,a1,1,2.5
1,a2,2,3
2,1,3,2.3
3,2,4,2.1
4,3,a3,2.4
a3,4,a4,2.5
***********
a2,1,6
1,2,6
2,3,8
3,4,8
4,a3,7