a,53743.136,61003.826
b,47943.002,66225.854
c,40049.229,53782.790
d,36924.728,61027.086
******************
1,2,3,4
*******************
1,a,b
a,1,2
3,2,1
c,2,3
c,3,d
3,4,d
1,4,3
4,1,b
*******************
1,b,5760.706
1,a,5187.342
2,a,7838.880
1,2,5483.158
2,3,5731.788
2,c,8720.162
c,3,5598.570
d,3,7494.881
3,4,7493.323
1,3,5438.382
d,4,5487.073
1,4,8884.587
b,4,7228.367