Ground Truth (X <tab> Y means X causes Y)
1	2
1	3
2	4
2	6
3	4
3	5
5	6


Coefficients
[1]= + noise_1
[3]= -0.979232([0]+0.0651789)^2 + noise_3
[5]= +1.78371([2]+0.96208)^3 + noise_5
[2]= +1.92459([0]+0.130554)^4 + noise_2
[6]= 0.81647 * ([1])^4 ([4])^4 + noise_6
[4]= +1.46956([1]-0.959344)^4 + noise_4
